medium · GRE Verbal
Researchers evaluating a museum’s free-admission policy observed that attendance rose after admission fees ended. They concluded that free admission caused the increase. The observation is suggestive, but a widely publicized exhibition opened simultaneously; until that possibility is separated from the intervention, the causal interpretation remains provisional. Which statement can be inferred from the passage?
- The identified alternative is certainly the sole cause of the observed change
- The intervention is more effective than every competing policy not discussed in the passage
- The observed change is compatible with the proposed explanation but does not by itself establish that explanation
- The proposed intervention never produces the claimed effect in any population, even under conditions that eliminate the alternative identified by the author
- Every comparable investigation has found the same association
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