hard · GRE Verbal
Researchers studying museum admission observed that attendance rose after admission fees were removed. They concluded that free admission produced the increase. The result is suggestive, but a nationally publicized exhibition opened simultaneously; unless that possibility is addressed, the causal claim remains provisional. Which additional study would most strengthen the researchers’ causal interpretation?
- Compare attendance after the exhibition closes while admission remains free.
- Repeat the original uncontrolled comparison while collecting a much larger number of participant anecdotes.
- Show through a separate opinion survey that the intervention is unusually popular with the participants.
- Document in detail that the measured outcome matters to policymakers responsible for the program.
- Compare the intervention with an unrelated program administered to a demographically different population.
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