medium · GRE Verbal
Researchers studying clinic reminders observed that missed appointments declined after text reminders began. They concluded that texts caused the decline. The result is suggestive, but the clinic simultaneously shortened appointment lead times; unless that possibility is addressed, the causal claim remains provisional. Which additional study would most strengthen the researchers’ causal interpretation?
- Compare patients randomized to receive or not receive texts under the same scheduling policy.
- 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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