hard · GRE Verbal
Researchers evaluating a crop-irrigation sensor observed that water use fell after sensors were installed. They concluded that the sensors improved efficiency. The observation is suggestive, but rainfall was substantially higher during the trial; until that possibility is separated from the intervention, the causal interpretation remains provisional. Which choice best describes the primary purpose of the passage?
- 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
- To narrate the historical development of research on the topic
- To compare the intervention with several alternative programs
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