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 choice best describes the primary purpose of the passage?
- To report the observed change without evaluating the researchers’ interpretation or distinguishing that interpretation from any simultaneous alternative
- To prove that the intervention should be abandoned in all future settings
- To narrate the historical development of research on the topic
- To compare the intervention with several alternative programs
- To present a causal interpretation and explain why the evidence does not yet securely establish it
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