hard · GRE Verbal
Researchers evaluating a home-insulation subsidy observed that winter energy use fell among subsidy recipients. They concluded that insulation caused the reduction. The observation is suggestive, but recipients also tended to replace old heating systems; until that possibility is separated from the intervention, the causal interpretation remains provisional. Which choice best describes the primary purpose of the passage?
- 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
- 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
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