Evaluating Causal Arguments and Alternative Explanations

8 questions

A regional health authority recently mandated that all public hospitals in the province implement a post-discharge digital health monitoring application for heart failure patients. Over the two years following the mandate, readmission rates for heart failure patients at these hospitals dropped by 22 percent. The health authority concluded that the remote monitoring application was directly responsible for the reduction in patient readmissions.

Which of the following would it be most useful to establish in order to evaluate the health authority's conclusion?

Whether patients using the digital application experienced an increase in overall life expectancy beyond the standard post-discharge follow-up period.

Whether readmission rates for heart failure patients also experienced a comparable decline at hospitals in neighboring districts that did not introduce the remote monitoring technology during the same timeframe.

Whether the initial implementation of the digital monitoring application led to temporary administrative delays for hospital nursing staff.

Whether the digital monitoring application caused patients to become overly reliant on automated alerts rather than contacting emergency services when severe symptoms developed.

Whether medical staff initially opposed the health authority's mandate on the grounds that software cannot replace in-person physician evaluations.

Show answer & explanation

Answer: Whether readmission rates for heart failure patients also experienced a comparable decline at hospitals in neighboring districts that did not introduce the remote monitoring technology during the same timeframe.

Answer

The correct answer is the option inquiring whether readmission rates for heart failure patients also experienced a comparable decline at hospitals in neighboring districts that did not introduce the remote monitoring technology during the same timeframe.

The correct answer establishes a controlled comparison group. Evaluating whether heart failure readmissions dropped similarly at comparable hospitals that lacked the digital application allows us to determine if the application was the true driver of the 22 percent reduction or if an unmentioned regional trend (e.g., changes in standard drug regimens or overall healthcare policies) produced the change.

Step-by-Step Solution

Identify the Premise and Conclusion

Premise: After public hospitals introduced a digital monitoring application, heart failure readmission rates fell by 22 percent over two years. Conclusion: The digital application caused the reduction in readmissions.

Understanding the precise causal link asserted by the argument is necessary before evaluating its validity.

Identify the Causal Flaw / Evaluation Need

The argument assumes correlation equals causation and ignores potential confounding variables or regional trends.

To evaluate a causal claim based on a single temporal event sequence, one must test whether an unstated third variable or broader trend produced the observed effect.

Apply Variance Test to Options

Comparing the target hospitals with a control group of non-adopting hospitals isolates the impact of the application from external regional variables.

If non-adopting hospitals saw the same drop, the application was not the cause. If non-adopting hospitals saw no drop, the application's causal role is strongly supported.

Key Concept

Evaluating Causal Arguments via Control Group Comparison

Question 2Question →

A technology company recently introduced an asynchronous communication policy, replacing mandatory daily team meetings with written status updates. Over the subsequent twelve months, the average time required for the software development team to complete project features decreased by 35 percent. The director of operations concluded that eliminating daily meetings directly caused the reduction in feature completion time by minimizing workplace disruptions. Which of the following would be most useful to determine in evaluating the director of operations' conclusion?

Whether the company implemented automated code-testing software during the same twelve-month period that significantly reduced deployment delays.

Whether the reduction in feature completion time directly caused software engineers to report higher overall job satisfaction.

Whether software developers at competing firms that retained mandatory daily meetings expressed a preference for written status updates.

Whether the asynchronous communication policy was applied to non-technical departments within the company in addition to the software development team.

Whether the director of operations had previously advocated for similar workplace policy changes at other software companies.

Show answer & explanation

Answer: Whether the company implemented automated code-testing software during the same twelve-month period that significantly reduced deployment delays.

Answer

Determining whether the company implemented automated code-testing software during the same twelve-month period that significantly reduced deployment delays is most useful in evaluating the conclusion.

The correct answer provides a critical test for an alternative explanation (confounding variable). In GMAT causal evaluation, an argument inferring causation from a temporal correlation can be evaluated by checking whether another major operational change occurred simultaneously. If automated testing software was introduced, that software could be the real reason completion times dropped, thereby weakening the director's claim. If no such software was introduced, that potential alternative cause is eliminated, strengthening the director's claim.

Step-by-Step Solution

Deconstruct the argument structure.

Premise: Meeting elimination was followed by a 35% decrease in feature completion time. Conclusion: Eliminating meetings directly caused the reduction in completion time by eliminating disruptions.

Identifying the premise and conclusion clarifies that the argument relies on a correlation-to-causation leap.

Identify the primary logical vulnerability in causal reasoning.

The argument assumes no external confounding factors or alternative explanations caused the productivity increase during the twelve-month period.

Causal claims based on chronological sequence (post hoc reasoning) are highly vulnerable to third-variable confounders.

Evaluate the answer choices against the Variance Test for causal evaluation.

If automated testing software was introduced (Yes), it offers an alternative cause for the faster completion times, weakening the conclusion. If no automated testing was introduced (No), an alternative cause is ruled out, strengthening the conclusion.

An option that yields opposite logical effects depending on a 'Yes' or 'No' answer is the correct evaluation factor.

Key Concept

Evaluating Causal Arguments by Rule-Out or Identification of Alternative Explanations

Question 3Question →

A recent municipal study observed that residents living within walking distance of public parks report significantly lower average stress levels than residents living in urban areas without green space. Based on this observation, city planners concluded that creating more public parks directly causes a reduction in the stress levels of nearby residents. Which of the following would be most important to determine in evaluating the city planners' conclusion?

Whether the city plans to construct additional public parks in high-density commercial districts over the next five years.

Whether residents living near public parks also report higher satisfaction with city public transportation services than other residents do.

Whether individuals with naturally lower stress levels are more likely to select housing locations near public parks.

Whether living near a public park guarantees a complete elimination of stress for every single resident.

Whether reducing resident stress levels is the single most effective way to improve overall urban public health outcomes.

Show answer & explanation

Answer: Whether individuals with naturally lower stress levels are more likely to select housing locations near public parks.

Answer

Determining whether individuals with lower stress levels naturally choose to live near parks evaluates the possibility of reverse causality.

The argument infers a direct causal link (proximity to parks reduces stress) from an observed correlation. To evaluate this claim, one must consider alternative explanations, such as reverse causality or self-selection. Determining whether lower-stress individuals systematically choose to live near parks tests whether pre-existing low stress determines housing choice rather than park proximity causing stress reduction.

Step-by-Step Solution

Identify the Premise and Conclusion in the argument

Premise: People near parks have lower stress than people far from parks. Conclusion: Parks directly cause lower stress.

The argument concludes causation based solely on an observed correlation between proximity to parks and lower stress.

Identify the key causal vulnerability

The argument assumes directionality (Park

\rightarrow

Lower Stress) without ruling out reverse causality (Lower Stress / Preference

\rightarrow

Choosing to live near a Park) or confounding variables.

A standard method for evaluating a causal claim is to test whether the presumed effect actually caused the presumed cause.

Evaluate the impact of self-selection

If stressed-free or health-conscious people move near parks, the correlation exists because of self-selection, invalidating the claim that parks cause the lower stress.

Determining this alternative direction directly tests the validity of the author's causal leap.

Key Concept

Evaluating Causal Arguments and Alternative Explanations

Estimated Time:1m 30s

Question 4Question →

A study conducted across several suburban art galleries noted that after the galleries installed soft ambient background music in their exhibition halls, average visitor dwell time increased by 35 percent compared to the previous year. Based on this observation, the gallery management concluded that playing ambient background music directly caused visitors to spend more time viewing the art. Which of the following would be most useful to evaluate in order to assess the strength of the gallery management's conclusion?

Whether the galleries concurrently hosted several major, highly anticipated special exhibitions during the period after the music was introduced

Whether visitors who naturally spend longer viewing artwork are more likely to prefer ambient background music over silence

Whether playing background music at high volumes in retail environments decreases overall customer satisfaction

Whether major metropolitan art museums attract a higher total number of annual visitors than suburban galleries

Whether a minor fraction of surveyed visitors reported that they did not consciously notice the background music during their visit

Show answer & explanation

Answer: Whether the galleries concurrently hosted several major, highly anticipated special exhibitions during the period after the music was introduced

Answer

Evaluating whether the galleries concurrently hosted several major, highly anticipated special exhibitions provides critical information about whether an alternative factor caused the increase in visitor dwell time.

The argument leaps from a sequence of events (installing music, followed by an increase in dwell time) to a direct causal claim. To evaluate this causal reasoning, one must determine whether an alternative explanation (confounder) was present during the same timeframe. If the galleries hosted major special exhibitions during this period, the exhibitions likely caused visitors to stay longer, weakening the causal link to the music. If no such exhibitions took place, the causal claim regarding the music is strengthened.

Step-by-Step Solution

Identify the author's causal claim and underlying evidence

The argument concludes that soft ambient music caused an increase in visitor dwell time based solely on a temporal correlation (music added -> dwell time increased).

Evaluating a causal claim requires testing whether the correlation could be explained by an alternative cause or confounding variable.

Assess candidate evaluation questions for potential confounding variables

If special exhibitions were launched at the same time, those exhibitions—rather than the music—could be the real reason visitors stayed longer.

Knowing whether special exhibitions occurred allows us to determine if an external factor produced the observed outcome.

Key Concept

Evaluating Causal Arguments and Alternative Explanations

Estimated Time:1m 50s

Question 5Question →

A ten-year study of commercial aviation maintenance facilities revealed that facilities adopting a novel AI-driven diagnostic system experienced a 35 percent drop in unscheduled engine repairs compared to facilities relying exclusively on traditional human technician inspections. The researchers concluded that the real-time predictive analytics of the AI diagnostic system directly prevented mechanical failures by detecting micro-wear patterns earlier than human inspectors could. Which of the following would it be most useful to investigate in order to evaluate the validity of the researchers' conclusion?

Whether the facilities that adopted the AI diagnostic system simultaneously instituted a policy replacing engine components based on fixed operational hours rather than waiting for detected wear.

Whether the technicians at facilities using the AI system required significantly more training hours than technicians operating under traditional inspection methods.

Whether traditional human technician inspections are capable of identifying non-mechanical failures that the AI diagnostic system is not programmed to detect.

Whether the financial cost of installing the AI diagnostic system exceeded the net savings realized from preventing unscheduled engine repairs.

Whether facilities that did not adopt the AI system possessed engines that were, on average, significantly older than the engines serviced at facilities adopting the AI system.

Show answer & explanation

Answer: Whether the facilities that adopted the AI diagnostic system simultaneously instituted a policy replacing engine components based on fixed operational hours rather than waiting for detected wear.

Answer

It would be most useful to determine whether facilities adopting the AI system simultaneously instituted a fixed-hour component replacement policy.

The correct answer provides information about a potential confounding variable. To establish that AI diagnostic analytics caused the 35 percent drop in unscheduled repairs, one must rule out other concurrent changes that could produce the exact same outcome. If the facilities using AI also switched to replacing engine components after a fixed number of operational hours, those scheduled replacements would prevent component failures before unscheduled repairs became necessary, rendering the AI system's micro-wear detection redundant or irrelevant to the observed statistical drop.

Step-by-Step Solution

Deconstruct the core argument

Premise: Facilities using AI diagnostics had 35% fewer unscheduled engine repairs than facilities using human inspectors. Conclusion: AI diagnostic analytics directly caused the reduction by detecting micro-wear early.

Evaluating a causal claim requires identifying the premise (correlation/observed difference) and the conclusion (causal attribution).

Identify the logical vulnerability

The argument assumes that no third factor (confounding variable) introduced concurrently with the AI system was responsible for preventing the unscheduled repairs.

Causal claims based on comparative facility outcomes are vulnerable to alternative explanations or co-occurring operational changes.

Evaluate the impact of the key question

If facilities adopting AI also began replacing components at fixed operational intervals, that routine maintenance policy—rather than AI early detection—could explain why engines rarely failed unscheduled. If they did not institute such a policy, the causal link to AI detection is strengthened.

Determining the presence of a co-occurring preventive measure directly tests whether an alternative cause explains the observed effect.

Key Concept

Evaluating Causal Claims via Alternative Explanations and Confounding Variables

Estimated Time:2m 0s

Question 6Question →

Over a five-year period in a coastal agricultural district, local fruit orchards gradually replaced synthetic chemical pesticides with natural predatory insects to control pest populations. During the exact same period, nearby estuarine populations of a threatened wild salmon species increased by over 30 percent. Environmental analysts concluded that the reduction in synthetic pesticide runoff was the direct cause of the recovery in the wild salmon population.

Which of the following would it be most useful to establish in order to evaluate the validity of the environmental analysts' conclusion?

Whether regional commercial fishing quotas for salmon were significantly reduced during the same five-year period

Whether the natural predatory insects introduced to the orchards also feed on non-pest insect species

Whether synthetic chemical pesticides are more expensive per acre than acquiring and maintaining predatory insect stocks

Whether growing salmon populations cause a decline in the abundance of local aquatic crustaceans

Whether orchards in neighboring inland valleys that continued using synthetic pesticides experienced lower overall fruit yields

Show answer & explanation

Answer: Whether regional commercial fishing quotas for salmon were significantly reduced during the same five-year period

Answer

The correct option is the one inquiring whether regional commercial fishing quotas for salmon were significantly reduced during the same five-year period.

The argument concludes that reduced pesticide runoff caused the 30 percent increase in wild salmon based solely on the fact that both changes occurred over the same five-year period. To evaluate a causal argument of this structure, one must test for alternative explanations that could account for the observed increase in salmon. Finding out whether regional commercial fishing quotas for salmon were significantly tightened during this period provides critical information: if quotas were reduced, fewer salmon were caught, offering a direct alternative explanation for the population rise. If quotas remained unchanged, alternative causes are minimized, strengthening the analysts' conclusion.

Step-by-Step Solution

Deconstruct the core argument and identify premises and conclusion

Premise: Orchards replaced synthetic pesticides with natural predators. Premise: Salmon populations increased by 30% over the same 5-year period. Conclusion: The reduction in pesticide runoff directly caused the increase in wild salmon populations.

Understanding the precise causal leap from observed correlation (pesticide change + salmon increase) to cause is necessary to evaluate the argument.

Identify the central assumption and vulnerabilities of the causal claim

The author assumes that no other co-occurring factor (confounding variable or alternative explanation) was responsible for the increase in salmon numbers.

Causal claims based on co-occurring events are vulnerable to alternative explanations that occurred during the same timeframe.

Assess the answer choices for a factor that tests for alternative causes

Checking whether commercial fishing quotas were reduced tests an alternative cause. If quotas were significantly reduced, the salmon population increase may be due to reduced harvesting rather than cleaner water.

Evaluating a prominent alternative explanation directly determines whether the stated cause or an unstated external factor produced the observed effect.

Key Concept

Evaluating Causal Arguments via Confounding Variables / Alternative Explanations

Estimated Time:2m 0s

Question 7Question →

A municipal transit authority recently applied a new light-reflecting polymer coating to crosswalks across three high-density commercial districts. Over the subsequent twelve months, nighttime pedestrian accidents in these districts decreased by 25 percent compared to the previous year. The authority concluded that the enhanced visual contrast provided by the polymer coating was the primary factor in reducing nighttime pedestrian accidents. Which of the following would it be most useful to determine in evaluating the transit authority's conclusion?

Whether municipal authorities also increased traffic enforcement patrols and lowered speed limits in those three districts during the same twelve-month period

Whether the decrease in pedestrian accidents directly led municipal officials to lower the maintenance budget for standard asphalt pavements

Whether reflective polymer coatings create daytime surface glare that slightly increases driver discomfort during peak sunlight hours

Whether adjacent suburban residential areas experienced an increase in personal vehicle registrations over the same twelve-month span

Whether local civic groups had initially voiced objections regarding the high upfront procurement costs of the polymer coating

Show answer & explanation

Answer: Whether municipal authorities also increased traffic enforcement patrols and lowered speed limits in those three districts during the same twelve-month period

Answer

Determining whether municipal authorities also increased traffic enforcement patrols and lowered speed limits in those three districts during the same twelve-month period is the most critical factor for evaluating the argument.

The correct answer provides information about potential confounding variables. In causal reasoning, establishing that event A caused event B requires verifying that no third factor (event C) occurred at the same time that could account for event B. If speed limits were lowered and police patrols were increased during the exact same period, those interventions offer a plausible alternative explanation for the drop in pedestrian accidents, directly challenging the conclusion that the polymer coating was the primary driver.

Step-by-Step Solution

Identify the argument structure and causal claim.

Premise: Crosswalks received reflective polymer coating; nighttime pedestrian accidents dropped by 25%. Conclusion: The polymer coating was the primary cause of the accident reduction.

Understanding the precise leap from observed correlation to claimed cause is essential for evaluating causal validity.

Identify the standard key vulnerabilities of causal arguments on the GMAT.

Causal claims can be evaluated by checking for alternative causes (confounding variables), reverse causality, or control group comparisons.

If another change occurred simultaneously, the observed effect might be attributable to that confounding factor rather than the polymer coating.

Evaluate the choices to find the factor that tests an alternative explanation.

Inquiring whether traffic police enforcement and speed limits were changed simultaneously tests whether an alternative cause produced the 25% decrease.

If enforcement increased and speed limits were lowered, those actions could account for the reduced accident rate, severely weakening the author's claim that the polymer coating was the primary cause.

Key Concept

Evaluating Causal Arguments: Identifying Confounding Variables and Alternative Explanations

Question 8Question →

A major telecommunications company recently replaced traditional underground fiber-optic cables with low-Earth-orbit satellite connections for all its remote enterprise clients. Over the following year, customer satisfaction scores regarding connection stability among these remote clients rose by 40 percent. The company's executives concluded that satellite technology is inherently more reliable than underground physical infrastructure for serving remote geographic locations. Which of the following would it be most useful to establish in order to evaluate the executives' conclusion?

Whether the company simultaneously replaced the client-side network routers for all remote enterprise accounts at the time of the transition

Whether satellite transmission technology is generally less expensive to install and maintain per client than traditional underground fiber-optic cabling

Whether the higher customer satisfaction scores led the telecommunications company to expand its satellite service offerings to urban markets

Whether remote enterprise clients plan to expand their business operations into additional geographic regions in the next fiscal year

Whether satellite coverage extended to new remote areas where residents previously had no access to any telecommunications infrastructure

Show answer & explanation

Answer: Whether the company simultaneously replaced the client-side network routers for all remote enterprise accounts at the time of the transition

Answer

The argument is best evaluated by establishing whether the company simultaneously replaced the client-side network routers for all remote enterprise accounts at the time of the transition.

The correct answer introduces a potential confounding factor: simultaneous client-side router replacement. If new routers were introduced at the same time as the satellite system, the observed stability increase could be attributed to the upgraded hardware rather than the satellite technology itself. Conversely, if no hardware was replaced, the argument's causal claim is significantly strengthened.

Step-by-Step Solution

Identify the premises and conclusion of the causal argument.

Premise: Fiber-optic cables were replaced with satellite connections, and stability satisfaction rose by 40%. Conclusion: Satellite technology caused the increase in connection reliability.

Understanding the precise cause-and-effect claim is necessary before evaluating alternative explanations.

Formulate key evaluation criteria for causal reasoning.

To test whether satellite tech caused the improvement, check if another simultaneous change (a confounding variable) could explain the positive outcome instead.

Causal claims based on observed before-and-after correlations are vulnerable to third-variable confounders.

Assess the answer choices for a factor that confirms or rules out an alternative cause.

Knowing whether client-side routers were replaced at the same time reveals whether the stability gain was caused by satellite tech or by superior router hardware.

If hardware was updated concurrently, the satellite connection itself may not be the cause of the performance improvement.

Key Concept

Evaluating Causal Arguments and Alternative Explanations

Estimated Time:1m 30s

Evaluating Causal Arguments and Alternative Explanations

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