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Logical Arguments and Causal Relationships

27 questions

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Question 1Question →

A financial research study across 60 regional credit unions examined the implementation of machine-learning credit risk algorithms and subsequent small-business loan default rates. The study observed that credit unions implementing machine-learning algorithms experienced a 40 percent lower default rate on small-business loans over a three-year period than credit unions relying strictly on traditional manual underwriting. Skeptical financial analysts contend that the algorithm itself did not cause the lower default rate. Instead, they argue that credit unions adopting the algorithm had systematically raised their minimum credit score requirements for all loan applicants immediately prior to software installation, thereby selecting an inherently lower-risk applicant pool.

Based on the information provided, select the statement that most strengthens the financial analysts' alternative explanation, and select the statement that most weakens the financial analysts' alternative explanation (thereby supporting a direct causal relationship between algorithm adoption and reduced defaults).

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Items

Strengthens Analysts' Alternative Explanation
Weakens Analysts' Alternative Explanation

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Answer

The statement strengthening the analysts' argument is that credit unions raising credit score requirements without the algorithm achieved equal default reductions. The statement weakening the analysts' argument is that default reductions occurred even among borrowers with credit scores below the new threshold.
To strengthen the analysts' claim that credit score threshold increases (and not algorithm installation) caused the reduction in defaults, we look for evidence showing that raising thresholds alone produces the same result. The statement noting that unions raising score thresholds without algorithms achieved equal default reductions directly confirms this alternative cause. To weaken the analysts' claim, we look for evidence where default reductions occurred independently of the higher credit score threshold. The statement showing default reductions among waiver-program borrowers below the threshold proves the algorithm worked even when the proposed confounding factor was absent.

Step-by-Step Solution

1
Analyze the causal claim and the counter-argument
Study Claim: Algorithm adoption causes lower default rates. Analysts' Claim: Tightened minimum credit score requirements (confounding variable), not the algorithm, caused lower default rates.
To strengthen or weaken an alternative causal explanation, we must isolate the proposed confounding variable (credit score threshold) from the primary variable (algorithm adoption).
2
Evaluate candidate statements to strengthen the analysts' argument
The statement regarding credit unions that raised credit score requirements without installing the algorithm shows that credit score tightening alone yields an identical default reduction. This proves the confounder is sufficient to explain the outcome without the algorithm.
A control group demonstrating that the outcome occurs to the same degree without the treatment directly strengthens the alternative explanation.
3
Evaluate candidate statements to weaken the analysts' argument
The statement showing default reductions among borrowers below the new credit score threshold demonstrates that the algorithm reduced defaults in a population where the credit score change was absent.
Demonstrating the effect in a subgroup unaffected by the proposed confounding variable directly undermines the claim that the confounder is responsible for the overall effect.

Key Concept

Evaluating Confounding Variables and Alternative Causal Explanations
Estimated Time:2m 30s
Question 2Question →

An agricultural research team conducted a five-year study across 30 coffee-growing districts to investigate the relationship between shade-tree canopy coverage and outbreaks of coffee leaf rust, a devastating fungal disease. The researchers observed that farms maintaining a dense shade canopy (>50% coverage) experienced a 60% lower incidence of fungal rust compared to full-sun farms (<10% coverage). Based on these observational findings, the head researcher hypothesized that the dense canopy directly creates a microclimate that inhibits the germination of fungal rust spores. From the options provided, select the statement that most strongly strengthens the head researcher's causal hypothesis for Column 1, and select the statement that most strongly weakens the causal hypothesis by providing an alternative explanation for Column 2.

Click a left item, then click its matching right item

Items

Column 1: Statement that most strongly STRENGTHENS the causal hypothesis
Column 2: Statement that most strongly WEAKENS the causal hypothesis via an alternative explanation

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Answer

For Column 1 (Strengthens), the correct choice is the statement confirming controlled laboratory evidence that shade microclimates directly prevent fungal spore germination. For Column 2 (Weakens), the correct choice is the statement revealing that shade-canopy farmers applied double the frequency of fungicides, providing a confounding alternative cause for the reduced infection rate.
The causal hypothesis asserts that dense shade canopy microclimates directly inhibit fungal rust spore germination. The statement providing controlled laboratory evidence that shade microclimates prevent germination directly verifies the proposed physiological mechanism, strongly strengthening Column 1. Conversely, the statement revealing that shade-canopy farmers applied twice as much fungicide provides a plausible alternative explanation for the lower rust rates, effectively weakening the causal claim for Column 2.

Step-by-Step Solution

1
Analyze the core argument and hypothesis in the stem.
Premise: High canopy farms have 60% lower rust incidence than full-sun farms. Hypothesis: Dense canopy shade directly creates a microclimate that inhibits fungal spore germination.
Understanding the precise causal link (shade microclimate -> reduced spore germination) is essential to evaluate strengthening and weakening statements.
2
Evaluate candidate statements for Column 1 (Strengthens).
The statement regarding controlled laboratory trials proves that the light and temperature conditions under shade directly stop spore germination, ruling out coincidental correlation and confirming the causal mechanism.
Direct experimental confirmation of the proposed mechanism strengthens a causal hypothesis.
3
Evaluate candidate statements for Column 2 (Weakens via alternative explanation).
The statement noting that shade-canopy farmers used twice as much fungicide introduces a confounding variable (fungicide treatment), which explains the lower rust levels without requiring shade microclimate to be the cause.
An alternative cause that accounts for the observed effect severely weakens the claim that shade microclimate was the driving factor.

Key Concept

Logical Arguments and Causal Relationships
Estimated Time:2m 0s
Question 3Question →

A fintech company implemented an automated peer-to-peer appreciation platform allowing employees to award micro-bonuses and commendations to colleagues in other departments. Over the following six months, cross-departmental dispute escalations submitted to executive management decreased by 35%. The HR analytics committee concluded that the appreciation platform directly caused the reduction in escalations by fostering cross-team goodwill.

Which of the following findings, if true, represent valid logical evaluations of the HR analytics committee's causal conclusion? Select TWO options: one statement that strongly STRENGTHENS the causal claim and one statement that provides a valid ALTERNATIVE CAUSAL EXPLANATION that weakens the claim.

Select all that apply

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Answer: Departments with the highest platform adoption rates experienced the largest percentage decreases in dispute escalations, whereas departments with negligible platform activity saw no change in escalation rates.; Simultaneously with the platform's launch, executive management instituted a strict policy that penalized department heads whose teams failed to resolve disputes internally before escalating them.

Answer

The two correct findings are: (1) the statement establishing that departments with higher adoption rates experienced larger decreases in escalations while inactive departments saw no change (Strengthener), and (2) the statement noting that executive management simultaneously instituted penalties for escalating disputes internally (Alternative Explanation / Weakener).
The causal argument claims that the peer appreciation platform caused a 35% drop in escalated disputes. The finding regarding adoption rates by department strengthens the argument by demonstrating a clear dose-response relationship between platform use and dispute reduction. The finding regarding executive penalties for escalated disputes weakend the argument by introducing a simultaneous, independent policy change that plausibly accounts for the decrease in escalations without requiring the platform's intervention.

Step-by-Step Solution

1
Identify the core causal argument in the prompt stem.
Premise: Peer recognition platform launched; dispute escalations dropped 35% six months later.
Conclusion: The platform directly caused the drop in escalations by fostering cross-team goodwill.
Evaluating a causal claim requires separating the observed event (correlation) from the inferred causal mechanism.
2
Evaluate candidate findings for a logical strengthener.
The statement showing a direct dose-response relationship (higher platform usage correlates with greater escalation drops across departments) eliminates key background noise and reinforces that the platform itself drives the effect.
Concomitant variation across controlled sub-groups provides strong empirical support for a causal relationship.
3
Evaluate candidate findings for a logical weakener / alternative explanation.
The statement detailing a simultaneous management policy penalty provides an alternate reason why escalations dropped (managers suppressed escalations to avoid penalties), undermining the claim that goodwill was the driver.
An unaddressed external factor introduced at the same time offers a competing explanation for the exact same outcome.

Key Concept

Causal Reasoning in Two-Part Analysis (Strengthening vs. Alternative Explanations)
Question 4Question →

An environmental study across 40 agricultural counties observed that farms adopting rotational grazing techniques experienced a 30 percent decrease in soil erosion compared to farms using traditional continuous grazing. Based on this correlation, agricultural consultants concluded that adopting rotational grazing directly causes a reduction in soil erosion. However, critics point out that farms adopting rotational grazing also tended to be located in areas with significantly higher baseline soil organic matter, which independently stabilizes soil structure. Which of the following pairs of statements best identifies: (1) a statement that, if true, would most STRENGTHEN the consultants' causal claim by addressing the critics' concern, and (2) a statement that, if true, would REVERSE the directional causality of the observed correlation?

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Answer: (1) Strengthener: Farms with low baseline soil organic matter experienced an identical 30 percent decrease in soil erosion after switching to rotational grazing; (2) Reversal: Decreased soil erosion creates favorable ground conditions that prompt farmers to adopt rotational grazing techniques.

Answer

(1) Strengthener: Farms with low baseline soil organic matter experienced an identical 30 percent decrease in soil erosion after switching to rotational grazing; (2) Reversal: Decreased soil erosion creates favorable ground conditions that prompt farmers to adopt rotational grazing techniques.
The correct choice accurately satisfies both conditions. First, showing that the 30 percent erosion reduction occurs even on farms with low baseline soil organic matter eliminates the critics' alternative explanation, thereby strengthening the consultants' claim. Second, stating that decreased erosion causes farmers to adopt rotational grazing flips the cause and effect, fulfilling the requirement for a causal direction reversal.

Step-by-Step Solution

1
Analyze the causal claim and the critics' counterargument
The consultants argue that Rotational Grazing (Cause) leads to Reduced Soil Erosion (Effect). Critics argue that Baseline Soil Organic Matter is a confounding variable driving both or causing the erosion reduction independently.
To strengthen the claim, a statement must eliminate or control for the confounding variable (soil organic matter).
2
Evaluate candidate statements for the Strengthener role
Showing that farms with LOW baseline soil organic matter still experience the 30% reduction when adopting rotational grazing isolates rotational grazing as the cause, effectively ruling out organic matter as the sole driver.
Demonstrating the effect persists when the potential confounding factor is absent isolates the primary cause.
3
Evaluate candidate statements for the Causal Reversal role
Showing that reduced soil erosion comes first and causes farmers to adopt rotational grazing reverses the directional relationship (Effect -> Cause instead of Cause -> Effect).
A reversal of causality demonstrates that the presumed outcome is actually the independent variable driving the action.

Key Concept

Causal Argument Analysis: Confounding Variables and Directional Causality
Question 5Question →

An agricultural research team evaluated the impact of a new organic bio-fertilizer, BioCrop, on wheat yield across 60 regional farms. The study observed that farms utilizing BioCrop produced an average wheat yield 25% higher than farms using traditional synthetic fertilizers. Consequently, the lead researcher concluded that applying BioCrop directly causes an increase in wheat yield.

Which of the following statements, if true, would weaken the lead researcher's causal conclusion by presenting an alternative explanation or confounding variable? Select TWO correct statements.

Select all that apply

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Answer: Farms that used BioCrop were also equipped with modern drip-irrigation systems that optimized water delivery during critical growth stages.; Farmers selected for the BioCrop group applied the product primarily to fields with higher baseline soil nutrient levels recorded prior to the study.

Answer

The two statements that weaken the conclusion are the statement regarding modern drip-irrigation systems and the statement regarding higher baseline soil nutrient levels.
The correct selections both introduce plausible alternative explanations for the observed higher yield. If farms using BioCrop also used drip-irrigation systems or already possessed superior soil fertility, the yield increase cannot be definitively attributed to BioCrop itself.

Step-by-Step Solution

1
Identify the causal argument structure
Premise: Farms using BioCrop had 25% higher yields than farms using traditional fertilizer. Conclusion: BioCrop directly causes the yield increase.
To weaken a causal claim (X↛YX \nrightarrow Y), one must demonstrate alternative causes (Z↛YZ \nrightarrow Y), reverse causality, or flawed experimental control.
2
Evaluate alternative explanations and confounding factors
The option noting drip-irrigation introduces an unobserved factor (ZZ) that improves yield. The option noting higher baseline soil nutrient levels indicates that the treatment group was inherently more fertile prior to BioCrop application.
Both factors provide plausible alternative reasons for the 25% higher yield that do not depend on BioCrop's effectiveness.
3
Eliminate invalid options
The options addressing purchasing cost, chemical comparison with compost, and future investment patterns fail to weaken the specific observational study's conclusion.
Irrational or irrelevant factors do not address the logical validity of the causal inference.

Key Concept

Evaluating Alternative Causes and Confounding Variables in Causal Arguments
Estimated Time:2m 0s
Question 6Question →

A regional health authority conducted a study across corporate workplaces to evaluate the impact of mandatory 15-minute guided mindfulness breaks introduced twice daily. Over a six-month trial, participating companies reported a 25% decrease in formal employee sick leave requests. Based on this outcome, the health authority concluded that the mindfulness breaks directly improved employee physical health and reduced illness incidence. Analysts and independent researchers provided four statements regarding these results.

Match each analytical statement with the precise logical role it plays in evaluating the health authority's causal argument.

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Items

Employees who participated in the breaks also voluntarily engaged in higher rates of personal exercise prior to and throughout the study period than non-participating control groups.
During the exact six-month trial period, participating companies also introduced a new remote-work policy allowing employees to work from home when feeling mildly unwell.
The reduction in sick leave requests occurred predominantly among employees reporting high baseline work stress, whereas sick leave rates remained unchanged in non-participating control companies operating under identical baseline conditions.
Employees reported avoiding formal sick leave submissions because they mistakenly believed doing so would forfeit annual wellness bonuses tied to program attendance.

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Answer

Each analytical statement correctly matches its respective logical role in causal argument evaluation: baseline exercise differences represent Selection Bias / Pre-existing Confounder; the new remote-work policy represents an Alternative Causal Explanation; concentrated stress-reduction with control validation represents Strengthening Evidence; and fear of losing bonuses represents a Measurement Artifact / Reporting Incentive Shift.
The correct pairings accurately classify each statement according to standard critical reasoning principles: pre-existing habit differences indicate selection bias; concurrent operational changes represent alternative explanations; controlled subgroup variance provides strengthening support; and metric distortion due to incentive perception represents a measurement artifact.

Step-by-Step Solution

1
Analyze the central causal claim made by the health authority.
The authority claims: Guided mindfulness breaks (Cause) directly led to improved physical health and reduced illness, measured via sick leave requests (Effect).
Evaluating logical arguments requires isolating the proposed cause, effect, and metric of measurement.
2
Evaluate the first statement regarding voluntary personal exercise.
It highlights pre-existing health habits in the participant pool, which points to selection bias rather than the intervention's efficacy.
When study subjects possess inherent baseline advantages, outcome differences cannot be attributed solely to the tested variable.
3
Evaluate the second statement regarding the simultaneous remote-work policy.
It presents an alternative cause for decreased formal sick leave filings (working from home while sick).
A confounding variable introduced concurrently with the treatment offers a competing explanation for the outcome.
4
Evaluate the third statement regarding stress-group concentration and control stability.
It confirms that the outcome occurred where expected (high-stress groups) and did not occur without the treatment (control groups).
Differentiating results between treatment and control groups while showing expected subgroup responsiveness strengthens a causal connection.
5
Evaluate the fourth statement regarding bonus forfeiture concerns.
It reveals that actual sickness may not have dropped, but rather employee willingness to officially report sick leave changed.
An incentive that discourages reporting alters the metric itself without changing the underlying health state being measured.

Key Concept

Causal Fallacies, Confounding Variables, and Argument Evaluation in Observational Data
Estimated Time:2m 0s
Question 7Question →

A telecommunications provider observed a 25% drop in subscriber churn in service areas where it concurrently upgraded its cell tower network to 5G and introduced a free device-protection plan for long-term contract holders. Company executives concluded that the speed improvements from the 5G upgrades were directly responsible for the reduction in subscriber churn. Which of the following statements, if true, provide valid logical evaluations that weaken the executives' causal conclusion? (Select all that apply.)

Select all that apply

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Answer: In service areas where the 5G tower upgrades were completed but the free device-protection plan was not offered, subscriber churn rates remained unchanged.; Subscribers in control markets who received the free device-protection plan without any 5G network upgrades experienced a comparable 25% drop in churn.

Answer

The two statements that weaken the executives' conclusion are the one showing that 5G upgrades alone caused no change in churn in areas without device protection, and the one showing that device protection alone produced an identical 25% drop in churn without 5G upgrades.
To weaken a causal claim derived from two simultaneous interventions, a valid response must isolate the variables. The statement establishing that churn remained unchanged when 5G upgrades were implemented without device protection proves that 5G speed improvements alone were not sufficient to reduce churn. Similarly, the statement demonstrating an identical 25% churn drop in markets receiving only device protection provides a strong alternative explanation for the outcome. Together, these two statements logically dismantle the executives' conclusion that 5G upgrades were the cause.

Step-by-Step Solution

1
Identify the causal argument and premise structure in the stem.
Premise: Two simultaneous changes occurred (5G upgrades and free device protection) alongside a 25% drop in churn. Conclusion: 5G upgrades directly caused the drop.
Evaluating a causal claim requires identifying whether conflated variables or alternative explanations exist.
2
Evaluate statements that test for confounding variables or variable isolation.
The statement showing no churn change in 5G-only areas isolates 5G and shows it is insufficient on its own. The statement showing a 25% churn drop in protection-only areas presents a viable alternative cause.
Showing that the supposed cause fails to produce the effect when isolated, or that the effect occurs without the supposed cause, invalidates a claim of exclusive causality.
3
Filter out irrelevant statements or logical fallacies.
Statements reversing causal direction, mentioning single-source tunnel vision, or discussing budget constraints do not logically weaken the causal relationship.
Only empirical or logical counter-evidence regarding the stated variables can effectively weaken a causal conclusion.

Key Concept

Evaluating Causal Arguments and Confounding Variables in Two-Part Scenarios
Question 8Question →

A corporate governance study monitored 60 multinational technology firms over a three-year period to evaluate the impact of introducing automated AI hiring software for mid-level managerial positions. The study observed that firms adopting the AI software experienced a 25 percent increase in annual manager turnover. Based on this observation, the lead researcher concluded that automated AI screening causes increased manager attrition because candidates selected by AI lack interpersonal compatibility with existing teams. Which of the following statements, if true, weaken the lead researcher's causal conclusion? Select all that apply.

Select all that apply

Show answer & explanation

Answer: Firms experiencing elevated manager turnover prior to the study were significantly more likely to adopt the automated AI hiring software to streamline recruitment.; Simultaneously with adopting the AI software, participating firms introduced stricter quarterly performance targets that resulted in higher rates of performance-based terminations.

Answer

The statements establishing selection bias in pre-existing high turnover firms and introducing an alternative explanation through stricter performance targets both weaken the causal conclusion.
The causal claim is that AI hiring software causes increased manager turnover due to team incompatibility. The option noting that high-turnover firms selectively adopted the AI software demonstrates reverse causality and selection bias, showing that turnover predated software adoption. The option noting that firms concurrently instituted stricter performance targets introduces a confounding variable that provides an alternative explanation for the increased terminations. Both statements undermine the researcher's conclusion.

Step-by-Step Solution

1
Identify the causal claim and proposed mechanism in the stem
The researcher claims that automated AI hiring software causes increased manager attrition due to poor interpersonal compatibility of AI-selected candidates.
Understanding the precise cause and effect is necessary to evaluate weakening conditions.
2
Evaluate statements for alternative causal directions or confounding variables
Showing that high turnover existed prior to adoption (reverse causality) or that stricter performance targets caused higher termination rates (confounding variable) invalidates the direct causal link.
Causal conclusions are weakened when reverse causality or confounding third variables explain the observed correlation.

Key Concept

Evaluating Causal Arguments and Weakening Causal Claims
Question 9Question →

A municipal study observed that cities with a higher number of public parks also report higher average levels of physical activity among their residents. Based on this observation, a researcher concluded that constructing public parks directly causes residents to become more physically active. Match each statement below with the logical role it plays in evaluating the researcher's causal claim.

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Items

A study demonstrating that residents significantly increase their weekly exercise routines after a new park opens in their neighborhood.
A survey indicating that individuals who are already highly active actively choose to relocate to cities with numerous existing parks.
Data showing that wealthier cities independently fund both extensive park construction and public fitness initiatives.

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Answer

Statement 1 strengthens the direct causal claim; Statement 2 demonstrates reverse causality; Statement 3 identifies a confounding common cause.
The correct matches accurately distinguish between evidence supporting direct causation, evidence illustrating reverse causation, and evidence establishing a third-variable confounder.

Step-by-Step Solution

1
Analyze the researcher's conclusion
The researcher posits a direct causal link: Park construction (Cause) →\rightarrow Resident activity (Effect).
Identifying the proposed direction of cause and effect is essential to evaluating logical roles.
2
Evaluate the first statement
The first statement establishes a chronological sequence where the park opening precedes the increase in activity, supporting direct causality.
Evidence showing that the cause precedes the effect strengthens a causal argument.
3
Evaluate the second statement
The second statement shows that active people move to cities with parks, implying activity level (Effect) drives the residency pattern near parks (Cause).
Reversing cause and effect undermines the researcher's claim of direct causality.
4
Evaluate the third statement
The third statement introduces municipal wealth as an alternate factor influencing both park availability and exercise programs.
A third factor causing both observed variables explains the correlation without direct causality.

Key Concept

Causal Reasoning and Logical Roles in Correlation Analysis
Question 10Question →

A corporate health study observed a strong positive correlation between weekly consumption of energy drinks and reported workplace stress levels among software engineers. The researchers hypothesized that the high caffeine content in energy drinks directly causes increased workplace stress.

Which of the following statements, if true, provide either valid evidence supporting the researchers' causal hypothesis or a valid alternative causal explanation for the observed correlation? Select all that apply.

Select all that apply

Show answer & explanation

Answer: Engineers who participated in a four-week trial eliminating energy drinks reported a statistically significant decrease in their workplace stress levels.; Engineers experiencing severe workplace stress often consume energy drinks as a coping mechanism to sustain focus during long hours.

Answer

The correct selections are the statement demonstrating that eliminating energy drinks reduces stress levels, and the statement explaining that workplace stress leads engineers to consume energy drinks.
The correct options are the statement showing that removing energy drinks lowers stress levels (which directly supports the causal hypothesis) and the statement revealing that high stress leads to energy drink consumption (which presents a valid reverse-causality alternative explanation for the observed correlation).

Step-by-Step Solution

1
Identify the core causal hypothesis in the stem.
Hypothesis: Energy drink consumption (Cause) leads to increased workplace stress (Effect).
Establishing the directional claim made by researchers is necessary to evaluate supporting or alternative evidence.
2
Evaluate statements for direct empirical support.
The trial showing reduced stress after eliminating energy drinks supports the causal claim by showing that removing the cause reduces the effect.
Demonstrating cause-and-effect control in a trial strengthens a causal hypothesis.
3
Evaluate statements for alternative causal explanations.
The statement that stressed engineers consume energy drinks as a coping mechanism provides a reverse causality explanation.
Reverse causality explains the correlation while challenging the original directional claim.

Key Concept

Evaluating Causal Arguments and Alternative Explanations
Question 11Question →

A metropolitan transportation authority implemented a peak-hour congestion pricing toll for private vehicles entering District X. Over the following 18 months, private vehicle traffic entering District X decreased by 22%22\%, while retail foot traffic in District X increased by 14%14\%. The transit board concluded that the congestion toll directly caused the increase in retail foot traffic by eliminating traffic congestion and encouraging suburban shoppers to visit downtown via public transit.

Match each logical argument role below with the statement that best exemplifies that role when evaluating the transit board's causal claim.

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Items

A statement that demonstrates a reverse causal relationship (the outcome causing the alleged factor)
A statement that identifies an independent confounding variable explaining both observed changes
A statement that invalidates a necessary assumption regarding transit infrastructure capacity

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Answer

The statement describing retail merchant lobbying matches the reverse causal relationship role; the statement concerning the launch of a zero-fare light rail line matches the confounding variable role; and the statement regarding transit lines operating at 99% capacity matches the invalidation of a necessary assumption role.
Each argument role correctly aligns with its corresponding logical effect: the merchant lobbying statement reverses the temporal and causal sequence; the zero-fare light rail statement introduces a concurrent external factor driving both observed trends; and the 99% transit capacity statement demonstrates a physical bottleneck that breaks a required link in the board's proposed mechanism.

Step-by-Step Solution

1
Analyze the board's core causal hypothesis.
Cause = Congestion pricing toll → Effect = Reduced car traffic & increased retail foot traffic via public transit conversion.
Establishing the explicit mechanism (toll → less car congestion → suburban shoppers take transit → higher foot traffic) is necessary to evaluate logical flaws.
2
Evaluate the statement concerning merchant lobbying.
This statement indicates that higher pedestrian traffic came first and caused the political demand for the toll.
This directly reverses the direction of causality (Y→XY \rightarrow X instead of X→YX \rightarrow Y), matching the reverse causal relationship role.
3
Evaluate the statement concerning the zero-fare light rail extension.
The light rail extension introduces an external event occurring at the same time that independently drives both observed trends.
A third factor (ZZ) that causes both decreased vehicle traffic and increased foot traffic constitutes a classic confounding variable alternative explanation.
4
Evaluate the statement concerning transit capacity operating at 99%.
Because transit was already saturated and received no upgrades, it physically could not carry new shoppers into District X.
The board's conclusion hinges on the unstated premise that transit could accommodate modal shift; proving capacity was zero invalidates this necessary assumption.

Key Concept

Evaluating Causal Arguments in Two-Part Analysis
Question 12Question →

A corporate study evaluated the relationship between flexible remote work policies and employee turnover in technology firms. Researchers observed that firms introducing remote work experienced a 20% drop in voluntary departures, leading them to conclude that remote work directly reduces employee burnout and thereby improves retention.

Match each statement below with the logical role it plays in evaluating this causal argument.

Click a left item, then click its matching right item

Items

Employees who already possess low burnout levels actively seek out and join firms that offer remote work options.
Firms that introduced remote work policies simultaneously implemented a 15% increase in overall employee salary.
Remote work eliminates long daily commutes, directly lessening physical strain and fatigue among employees.

Matches

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Answer

The statement regarding employee self-selection reverses the direction of causality. The statement regarding concurrent salary increases introduces a confounding variable. The statement regarding commute stress elaborates on the causal mechanism.
Each statement directly matches its precise logical role in causal analysis: reversing cause and effect exposes selection bias; introducing concurrent pay raises presents an alternative explanation; and detailing commute reduction establishes the causal mechanism.

Step-by-Step Solution

1
Analyze the core causal argument
Cause: Remote work policy -> Intermediary Effect: Reduced burnout -> Final Effect: Reduced voluntary turnover.
Establishing the precise structure of the argument is essential to determine how new statements alter its validity.
2
Evaluate the statement on employee self-selection
Shows that low burnout precedes placement in remote work positions.
When the presumed effect (low burnout) is the condition that leads to the presumed cause (remote work), the causal direction is reversed.
3
Evaluate the statement on salary increases
Identifies an unaddressed parallel factor capable of reducing turnover.
An independent, concurrent change offers an alternative causal explanation for the outcome, serving as a confounding variable.
4
Evaluate the statement on commute strain
Provides the step-by-step physical explanation connecting remote work to burnout reduction.
Detailing the intermediate pathway strengthens a causal claim by demonstrating how the cause produces the effect.

Key Concept

Causal Arguments: Reverse Causality, Confounding Variables, and Underlying Mechanisms
Question 13Question →

A municipal environmental agency conducted a study across 50 comparable mid-sized cities over a four-year period. The study observed that cities that introduced a mandatory pay-as-you-throw (PAYT) unit-pricing system—charging households per bag of municipal solid waste disposed—experienced a 35 percent decrease in landfilled waste and a 20 percent increase in curbside recycling rates. The environmental director concluded that the financial burden of the PAYT fees directly caused households to adopt waste-minimization habits and actively divert recyclable materials from the waste stream.

Which two of the following statements, if true, most strongly support the environmental director's causal conclusion?

Select all that apply

Show answer & explanation

Answer: In the cities implementing PAYT, the reduction in landfilled waste began immediately following the introduction of per-bag fees rather than during prior years when public awareness campaigns were active.; Similar mid-sized cities in the same geographic region that did not implement a PAYT system experienced no significant change in landfilled waste volumes or recycling rates over the four-year study period.

Answer

The two statements that most strongly support the causal conclusion are: (1) the statement indicating that waste reduction began immediately after per-bag fees were introduced rather than during prior awareness campaigns, and (2) the statement showing that control cities without PAYT experienced no significant changes in waste or recycling levels.
To strengthen a causal claim of the form 'X caused Y', an argument must demonstrate that Y occurred specifically following X (temporal precedence) and that Y does not occur in the absence of X (control comparison), while eliminating alternative explanations. The statement noting that waste reduction began immediately after per-bag fees were introduced establishes clear temporal precedence, ruling out earlier public awareness campaigns as the cause. The statement confirming that control cities without PAYT saw no changes in waste or recycling rules out broader regional macro-trends.

Step-by-Step Solution

1
Identify the director's core causal claim
The core claim is that mandatory per-bag PAYT fees directly caused households to decrease landfilled waste and increase recycling.
Evaluating causal arguments requires isolating the proposed cause (unit-pricing fees) and effect (waste reduction/recycling increase).
2
Evaluate potential strengtheners for temporal precedence and control group validity
The statement showing that waste reduction immediately followed fee implementation demonstrates temporal precedence over alternative factors like public awareness campaigns. The statement establishing that non-PAYT cities saw no changes provides a control group ruling out regional trends.
Showing that the effect occurs specifically when and where the cause is present (and not when/where it is absent) reinforces the causal link.
3
Identify and eliminate weakeners and irrelevant statements
The option describing pre-existing high recycling rates suggests selection bias (reverse/alternative causation). The option mentioning single-use plastic bans introduces a confounding variable. The option regarding collection frequency is irrelevant.
Alternative explanations and confounding variables undermine the claim that PAYT fees were the primary driver of the observed outcome.

Key Concept

Causal Argument Evaluation: Establishing Control Groups and Temporal Precedence
Question 14Question →

A marine biology study observed that coral reefs with higher populations of herbivorous parrotfish experienced significantly lower levels of algae overgrowth over a five-year monitoring period. Based on these results, the lead researchers concluded that the presence of parrotfish prevents algae overgrowth on coral reefs.

Which of the following correctly pairs the proposed independent cause and the dependent effect in the researchers' conclusion?

Show answer & explanation

Answer: Cause: Presence of herbivorous parrotfish | Effect: Lower levels of algae overgrowth

Answer

Cause: Presence of herbivorous parrotfish | Effect: Lower levels of algae overgrowth
The conclusion asserts that the presence of parrotfish prevents algae overgrowth. Therefore, the presence of parrotfish is the independent cause, and the lower level of algae overgrowth is the dependent effect.

Step-by-Step Solution

1
Analyze the causal claim in the conclusion.
The claim states that 'the presence of parrotfish prevents algae overgrowth on coral reefs.'
Identifying the explicit conclusion isolates the variables being evaluated.
2
Determine which variable acts as the independent cause.
The presence of herbivorous parrotfish is the action/agent producing the change.
In causal reasoning, the cause is the independent variable introduced or observed first that influences the outcome.
3
Determine which variable acts as the dependent effect.
Lower levels of algae overgrowth is the outcome resulting from the action.
The effect is the measured response or dependent variable produced by the cause.

Key Concept

Distinguishing Cause and Effect in Causal Arguments
Estimated Time:45s
Question 15Question →

An industrial research group analyzed 80 semiconductor manufacturing facilities over a three-year period to evaluate the impact of an Automated Predictive Maintenance (APM) system on equipment failure rates. The study recorded that facilities operating APM software experienced 40% less unplanned downtime than facilities operating without APM.

Critics argue that this observed correlation does not prove causation, hypothesizing instead that facilities electing to adopt APM already possessed superior quality-control protocols and newer machinery, which independently caused the lower downtime.

Based on the information above, which of the following joint selections correctly identifies both a finding that most strongly supports the claim that APM adoption directly caused the reduction in downtime (Column 1) AND a finding that most strongly supports the critics' counter-explanation (Column 2)?

Show answer & explanation

Answer: Column 1: Facilities adopting APM mid-study experienced an immediate 40% drop in downtime while keeping machinery age and maintenance protocols constant; Column 2: Facilities with older machinery that adopted APM experienced no reduction in downtime relative to non-adopting facilities of identical machinery age.

Answer

Column 1: Facilities adopting APM mid-study experienced an immediate 40% drop in downtime while keeping machinery age and maintenance protocols constant; Column 2: Facilities with older machinery that adopted APM experienced no reduction in downtime relative to non-adopting facilities of identical machinery age.
The correct selection properly assigns the logical roles. To strengthen the claim that APM adoption directly causes lower downtime (Column 1), one must rule out alternative explanations by demonstrating an immediate drop in downtime following APM installation while holding pre-existing variables constant. To support the critics' counter-explanation (Column 2), one must show that APM adoption provides no benefit in the absence of superior machinery/protocols, confirming that the pre-existing factors were driving the observed performance.

Step-by-Step Solution

1
Analyze the core argument and the critics' counter-hypothesis.
Primary claim: APM adoption directly reduces unplanned downtime. Critics' counter-explanation: Pre-existing factors (newer machinery, stricter protocols) caused lower downtime, making the APM correlation spurious.
Establishing the exact logical roles required for Column 1 (Strengthens APM causation) and Column 2 (Supports critics' counter-explanation).
2
Identify the finding that strengthens the APM causal claim for Column 1.
A finding showing that when APM is introduced while controlling for confounding variables (machinery age and protocols remain constant), downtime drops immediately.
Controlling for confounding variables isolates APM as the sole cause of the downtime reduction.
3
Identify the finding that supports the critics' counter-explanation for Column 2.
A finding showing that when APM is introduced into facilities without newer machinery or strict protocols, it fails to produce a downtime reduction.
This demonstrates that APM alone is ineffective without the underlying pre-existing facility characteristics, validating the critics' argument.
4
Match findings to Column 1 and Column 2 in correct order.
Column 1 must contain the controlled mid-study drop evidence, and Column 2 must contain the ineffective APM on older equipment evidence.
Ensures column assignments are not reversed.

Key Concept

Causal Arguments and Confounding Variable Isolation in Two-Part Analysis
Question 16Question →

An epidemiological task force conducted a two-year study across 50 regional hospital wards to evaluate the efficacy of newly installed continuous-discharge ultraviolet-C (UV-C) air disinfection units. During the study period, the incidence rate of hospital-acquired airborne respiratory infections in these 50 wards decreased by 40%40\%. Based on this observation, the hospital administration concluded that the installation of the UV-C units directly caused the reduction in airborne infection rates.

Match each logical role on the left with the statement on the right that best fulfills that role in evaluating the hospital administration's causal argument.

Click a left item, then click its matching right item

Items

Statement that identifies a confounding variable that weakens the causal conclusion
Statement that demonstrates a potential causal direction reversal
Statement that serves as an assumption required by the administration's causal conclusion
Statement that strengthens the causal conclusion by ruling out an alternative explanation

Matches

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Answer

The correct pairings match: (1) the confounding variable role with the statement regarding the simultaneous implementation of a mandatory surface decontamination protocol; (2) the causal direction reversal role with the statement regarding system deployment being triggered by prior infection spikes and staff vigilance; (3) the necessary assumption role with the statement that ventilation rates and physical layouts remained constant; and (4) the strengthening statement role with the observation that infection rates in non-participating control wards did not decrease.
The correct pairings accurately assign each logical role to its corresponding statement based on standard GMAT causal analysis principles. The co-occurring decontamination protocol serves as a confounding variable because it introduces an unmeasured alternative cause for lower infection rates. The deployment of UV-C units in response to prior infection spikes illustrates causal direction reversal by demonstrating that infection conditions triggered the intervention. The constancy of mechanical ventilation rates represents a required assumption because significant changes in ventilation would invalidate the claim that UV-C units were responsible. Finally, the lack of infection reduction in control wards strengthens the causal claim by demonstrating that the outcome does not occur in the absence of the intervention.

Step-by-Step Solution

1
Analyze the core causal argument in the stem.
Premise: UV-C units installed →\rightarrow 40%40\% drop in airborne infections. Conclusion: UV-C units directly caused the reduction.
Deconstructing the argument into cause, effect, and underlying assumptions is necessary to evaluate statements against specific logical roles.
2
Identify the confounding variable (left_1).
The statement describing the simultaneous implementation of a surface decontamination protocol introduces an alternative explanatory variable introduced at the same time as the UV-C units.
A confounding variable is an external factor that correlates with both the presumed cause and effect, offering an alternative explanation for the outcome.
3
Identify the causal direction reversal (left_2).
The statement noting that UV-C deployment was approved in response to severe infection spikes reveals that high infection rates drove the administrative decision and staff vigilance.
Reversing causal direction involves showing that the outcome or pre-existing state influenced the implementation of the condition rather than the condition causing the outcome.
4
Identify the required assumption (left_3).
The statement asserting that mechanical ventilation rates and ward physical layout remained constant is a necessary assumption.
If ventilation rates had significantly increased, that environmental change could explain the infection drop; assuming stability in these factors is required for the argument to hold.
5
Identify the strengthening statement (left_4).
The statement showing that non-participating control wards experienced no infection drop reinforces the causal claim.
Demonstrating that the effect is absent when the cause is absent (control group comparison) rules out general background trends and strengthens the causal link.

Key Concept

Causal Reasoning in Two-Part Analysis: Confounding Factors, Reverse Causality, Necessary Assumptions, and Control Comparison
Question 17Question →

An urban ecology study across 40 metropolitan districts evaluated the impact of municipal sanitation infrastructure on local avian populations over a five-year period. In districts that replaced traditional open trash receptacles with sealed, animal-proof containment bins, researchers recorded a 40% reduction in local crow populations within 18 months. The researchers hypothesized that restricting access to human food waste directly caused the decline in the local crow population.

Consider the following two logical roles regarding the researchers' causal hypothesis:
- Column 1: A statement that, if true, most strongly SUPPORTS the hypothesis.
- Column 2: A statement that, if true, most strongly WEAKENS the hypothesis by demonstrating a causal direction reversal or an unaddressed alternative cause.

Which of the following joint selections correctly identifies a supporting statement for Column 1 and a weakening statement for Column 2?

Show answer & explanation

Answer: Column 1: Adjacent control districts maintaining open receptacles showed stable crow populations, while tagged crows in sealed-bin districts exhibited severe caloric deficits; Column 2: Municipalities installed sealed bins specifically in response to a pre-existing drop in crow numbers caused by an avian pox outbreak.

Answer

Column 1: Adjacent control districts maintaining open receptacles showed stable crow populations, while tagged crows in sealed-bin districts exhibited severe caloric deficits; Column 2: Municipalities installed sealed bins specifically in response to a pre-existing drop in crow numbers caused by an avian pox outbreak.
The correct selection properly aligns both logical roles. For Column 1, evidence that control districts with open bins maintained stable populations while crows in sealed-bin districts suffered caloric deficits directly supports the claim that food waste restriction caused the population decline. For Column 2, evidence that bin installation occurred in response to a pre-existing decline caused by avian pox undermines the hypothesis by reversing the temporal sequence (showing the population drop came first) and introducing an alternative cause.

Step-by-Step Solution

1
Analyze the causal claim in the stem.
Cause: Restricting access to human food waste via sealed bins. Effect: 40% reduction in local crow population.
To evaluate support and weaken statements, the precise independent cause and dependent effect must be clearly isolated.
2
Identify the criteria for Column 1 (Support).
Column 1 requires evidence showing that the absence of the cause (control districts with open bins) prevents the effect, and that the proposed mechanism (caloric restriction) is active in the treatment group.
Demonstrating control stability alongside evidence of the hypothesized mechanism strongly reinforces a causal link.
3
Identify the criteria for Column 2 (Weaken via Causal Reversal / Alternative Cause).
Column 2 requires a statement showing either that the decline in crow population occurred prior to bin installation (causal direction reversal) or was driven by an unmeasured confounder (avian pox outbreak).
If the decline in crows caused the installation of bins rather than vice versa, the researchers' causal hypothesis is completely invalidated.
4
Evaluate the joint options to find the correct pairing.
The option placing the control group / caloric deficit evidence in Column 1 and the pre-existing disease / reversed timeline evidence in Column 2 is the unique correct pairing.
Only this option places both logically complementary statements in their correct designated columns without reversal or irrelevance.

Key Concept

Two-Part Analysis Causal Argument Evaluation & Reversal Identification
Question 18Question →

A marine biology research team conducted a two-year observational study to investigate a sharp decline in sea urchin populations following the deployment of new modular coastal breakwaters. The researchers hypothesized that trace copper leaching from the metallic reinforcement bars within the breakwaters directly caused the increased sea urchin mortality.

Match each logical argument role on the left with the statement on the right that best fulfills that role in evaluating the researchers' causal claim.

Click a left item, then click its matching right item

Items

Statement that most strongly weakens the researchers' causal hypothesis
Statement that most strongly strengthens the researchers' causal hypothesis
Statement that exemplifies a causal direction reversal

Matches

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Answer

The statement regarding mortality rates rising prior to breakwater construction weakens the hypothesis; the statement comparing breakwaters without copper reinforcement strengthens the hypothesis; and the statement claiming dying urchins accelerate copper leaching exemplifies a causal direction reversal.
Matching the statement showing mortality preceded breakwaters to the weakening role is correct because a cause cannot postdate its effect. Matching the statement comparing copper-free breakwaters to the strengthening role is correct because it acts as a control isolating the copper variable. Matching the statement claiming dying urchins cause copper leaching to the causal reversal role is correct because it inverts the direction of causality.

Step-by-Step Solution

1
Analyze the stem's causal claim.
The researchers claim that copper leaching from breakwater reinforcement bars (Cause) leads to increased sea urchin mortality (Effect).
Establishing clear cause and effect boundaries is essential before evaluating potential strengthening, weakening, or reversed statements.
2
Evaluate candidate statements for weakening the claim.
The observation that urchin mortality increased eight months prior to breakwater deployment shows that the effect preceded the cause, invalidating the proposed causal link.
A cause cannot occur after its effect.
3
Evaluate candidate statements for strengthening the claim.
The control group finding—where identical breakwaters without copper resulted in stable urchin populations—isolates copper as the specific causal driver.
Eliminating alternative explanations and showing that removing the cause eliminates the effect strengthens a causal argument.
4
Identify the statement representing a causal direction reversal.
The statement asserting that dying urchins accelerate copper leaching posits that the mortality event causes the copper leaching, reversing the hypothesized causal vector.
Causal reversal occurs when the outcome variable is mistaken for the driver variable.

Key Concept

Logical Arguments and Causal Relationships in Two-Part Analysis
Estimated Time:2m 0s
Question 19Question →

A telecommunications company conducted a 12-month study across 40 regional markets to evaluate why customer churn dropped significantly following the introduction of a self-service mobile application. The lead analyst hypothesized that the mobile application's automated troubleshooting feature directly caused the reduction in customer churn by resolving service disruptions without requiring support calls. Which TWO of the following statements, if true, most strongly strengthen the lead analyst's causal hypothesis?

Select all that apply

Show answer & explanation

Answer: In a controlled subset of markets where all application features except automated troubleshooting were enabled, customer churn rates remained identical to pre-application levels.; In markets where the automated troubleshooting feature was actively used, support call volume for service disruptions decreased by 45%, coinciding directly with the sharpest drops in customer churn.

Answer

The two statements that strengthen the hypothesis are: (1) the statement showing that market subsets lacking only the automated troubleshooting feature experienced no drop in churn, and (2) the statement showing that active troubleshooting use directly correlated with decreased support calls for disruptions and reduced churn.
The lead analyst's hypothesis asserts that the automated troubleshooting feature reduced churn by resolving service disruptions. The statement demonstrating that markets with all app features except troubleshooting experienced no change in churn isolates the troubleshooting feature as the necessary cause. The statement showing that active troubleshooting usage led to decreased disruption support calls alongside drops in churn provides positive empirical confirmation of the underlying mechanism.

Step-by-Step Solution

1
Identify the core causal claim in the argument stem.
The lead analyst claims that the automated troubleshooting feature (Cause) directly led to lower customer churn (Effect) by resolving service disruptions without support calls (Mechanism).
Strengthening a causal claim requires establishing that the cause produces the effect and ruling out alternative causes or reversed causality.
2
Evaluate statements for evidence that supports the causal mechanism or isolates the cause.
The statement showing churn remained unchanged when all features EXCEPT troubleshooting were present isolates the troubleshooting feature as the essential cause. The statement linking active troubleshooting usage to fewer call disruptions and lower churn confirms the proposed mechanism.
These two statements provide controlled evidence supporting the exact causal link hypothesized by the analyst.
3
Identify distractors containing causal reversals, alternative explanations, or irrelevant data.
The option describing disruption frequency driving app downloads reverses cause and effect. The option regarding nationwide price discounts introduces a confounding variable. The option regarding survey response rates provides irrelevant data.
Distractor options either weaken the argument or fail to address the core causal mechanism.

Key Concept

Causal Arguments and Two-Part Logical Strengthening
Question 20Question →

A marine research consortium monitored 40 coastal inlets over a three-year period to evaluate the impact of deploying synthetic kelp modules intended to restore abalone populations. Inlets equipped with synthetic kelp modules exhibited a 30 percent increase in juvenile abalone survival relative to control inlets lacking the modules. Based on these findings, a lead biologist hypothesized that synthetic kelp modules increased juvenile abalone survival by providing physical shelter from predatory sea otters.

Select for Column 1 the statement that most strongly strengthens the biologist's shelter hypothesis against potential confounding factors. Select for Column 2 the statement that exemplifies a causal direction reversal regarding abalone population density and synthetic kelp module presence.

Click a left item, then click its matching right item

Items

Column 1: Statement that strengthens the shelter hypothesis
Column 2: Statement demonstrating causal direction reversal

Matches

Show answer & explanation

Answer

For Column 1, the statement strengthening the shelter hypothesis is the observation that inlets with synthetic kelp modules saw a steep decline in otter-related abalone mortality while control inlets saw no such decline. For Column 2, the statement demonstrating causal direction reversal is the claim that higher pre-existing densities of juvenile abalone cause technicians to deploy synthetic kelp modules in those specific inlets.
For Column 1, demonstrating that otter-specific predation declined exclusively in inlets containing synthetic kelp directly validates the predator-shelter mechanism proposed by the biologist. For Column 2, asserting that higher existing abalone concentrations cause human teams to deploy synthetic kelp modules reverses the assumed causal direction, positioning abalone density as the cause rather than the effect.

Step-by-Step Solution

1
Analyze the causal argument in the stem
The biologist proposes a specific causal link: Synthetic kelp modules provide physical shelter from sea otters →\rightarrow reduced predation →\rightarrow increased juvenile abalone survival.
Understanding the precise mechanism is necessary to evaluate strengthening evidence and causal direction.
2
Evaluate candidate statements for Column 1 (Strengthening the shelter hypothesis)
The statement noting a steep decline in otter-related mortality specifically in module-equipped inlets compared to control inlets directly confirms the proposed predator-shelter mechanism, strengthening the biologist's conclusion.
Demonstrating that the specific hypothesized mediator (reduced otter predation) occurred exclusively where the treatment was applied confirms the causal pathway.
3
Evaluate candidate statements for Column 2 (Causal direction reversal)
The statement explaining that higher pre-existing abalone densities prompt technicians to place synthetic kelp modules in those locations turns the causal arrow around: Abalone Density→Kelp PlacementAbalone\ Density \rightarrow Kelp\ Placement instead of Kelp Placement→Abalone DensityKelp\ Placement \rightarrow Abalone\ Density.
Causal direction reversal occurs when the assumed effect is actually the cause driving the assumed intervention.

Key Concept

Two-Part Causal Analysis and Direction Reversal
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