Conclusion The fact that people who exercise vigorously are sick less often than average does not prove that vigorous exercise prevents illness, for Support whether one exercises vigorously or not depends in part on one's preexisting state of health.
The author observes a correlation: people who exercise vigorously are sick less often. You might look at that and think vigorous exercise must prevent illness. But the author says not so fast. The reason you can't draw that conclusion is that
The reasoning pattern here is:
- Correlation: A and B tend to go together.
- Someone might conclude: A causes B.
- Author's response: That conclusion isn't proven, because B could cause A instead (reverse causation).
We need to find an answer that follows this same pattern: a correlation is observed, and the author argues that the correlation doesn't prove a particular causal relationship by pointing out the causation could run the other way.
Analysis by Kevin_Lin
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