hard · GRE Verbal
Researchers evaluating a wetland-restoration project observed that shorebird counts rose after channels were reopened. They concluded that the restoration increased habitat use. The observation is suggestive, but an unusually mild migration season increased regional counts; until that possibility is separated from the intervention, the causal interpretation remains provisional. Which statement can be inferred from the passage?
- 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
- 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
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