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Difficulty: HardCorrelation vs. Causation

Medical researcher: A recent comprehensive study tracking adults over a ten-year period revealed a striking trend. Individuals who regularly participate in high-impact cardiovascular activities, such as running and competitive sports, report a significantly lower incidence of chronic joint pain than those who do not. Clearly, engaging in high-impact cardiovascular activities must help to protect against the deterioration of joint health.

The medical researcher's argument is most vulnerable to criticism on which one of the following grounds?

  1. A
    It attempts to derive a conclusion about the absolute number of people suffering from joint pain based solely on evidence concerning proportional incidence rates.
  2. B
    It presumes, without providing evidence, that chronic joint pain is the only medical condition that deters individuals from participating in high-impact sports.
  3. It fails to consider that the observed correlation could be entirely explained by the fact that individuals who are already prone to chronic joint pain tend to avoid high-impact cardiovascular activities.Answer
  4. D
    It confuses a factor that is sufficient to prevent joint deterioration with one that is necessary to prevent it.
  5. E
    It mistakenly treats the claim regarding the lower reported incidence of chronic joint pain as the main conclusion of the argument rather than as a premise.

Answer

The correct answer is the option stating that the argument fails to consider that the correlation could be explained by individuals with joint pain avoiding high-impact activities.
The argument makes a classic causal flaw by assuming that because two phenomena are correlated (high-impact exercise and a lower incidence of joint pain), the first must cause the second. It entirely overlooks the possibility of reverse causation. It is highly plausible that having healthy, pain-free joints is a prerequisite for engaging in high-impact activities like running. Thus, the lack of joint pain causes the ability to exercise, not the other way around. The correct option precisely identifies this vulnerability.

Step-by-Step Solution

1
Identify the premise and conclusion of the argument.
Premise: There is a correlation between regular high-impact cardiovascular activities and a lower incidence of chronic joint pain. Conclusion: High-impact activities protect against joint health deterioration.
Understanding the argument's structure is the first step in evaluating its logical soundness.
2
Analyze the reasoning linking the premise to the conclusion.
The researcher observes a statistical correlation and immediately assumes a specific causal relationship (Activity causes Better Joint Health).
Identifying the leap from correlation to causation reveals the core vulnerability of the argument.
3
Evaluate alternative explanations for the observed correlation.
The correlation could be explained by reverse causality: the state of one's joint health determines their ability to exercise (Better Joint Health enables Activity), rather than the exercise causing the joint health.
A valid criticism of a causal conclusion drawn from a correlation is pointing out a plausible alternative cause, such as the reverse causal direction.
4
Select the option that matches this alternative explanation.
The option describing how people already prone to joint pain tend to avoid high-impact activities perfectly captures this reverse causal relationship.
This directly targets the argument's failure to consider that the causal arrow might point in the opposite direction.

Key Concept

Correlation vs. Causation (Reverse Causality)
Estimated Time:1m 45s
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Topics

Correlation vs. Causation

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