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.
Sign up free to see the explanation and track your rank →
More GRE Verbal practice
- Which of the following, if true, most helps to resolve the paradox?
- Which of the following, if true, most helps to resolve the paradox?
- The novelist was known for his ________ descriptions of nature, which often spanned severa
- Naturalist: The blue-throated warbler and the gray-crowned warbler occupy the same forest
- The sudden ________ in the expansion of the metropolitan district was attributed to the en
- Naturalist: On this island, the native songbird population has declined sharply over the p
- Public-health officials worried that a new vaccination campaign would falter because many
- Had the investigator been more ________, she might have discovered the discrepancy in the