hard · GRE Verbal
Researchers studying reading program observed that participants improved more than nonparticipants. They concluded that the program caused the gain. The result is suggestive, but participants volunteered and began with greater motivation; unless that possibility is addressed, the causal claim remains provisional. Which statement can be inferred from the passage?
- The observed change is consistent with the researchers’ explanation but does not by itself establish that explanation.
- The researchers’ proposed explanation has been conclusively disproved by the unresolved alternative and therefore can never explain the outcome in any population or setting.
- Every comparable study in other settings has independently produced precisely the same causal result.
- The alternative explanation identified by the author is certainly the sole cause of the observed change.
- The intervention is more effective than every competing policy that could address the same underlying problem.
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