medium · GMAT Verbal
A researcher claims that a new teaching method causes higher test scores, pointing to a rise in scores after the method was introduced.
Which finding would be most helpful in strengthening the claim that the method actually causes the higher scores?
- The new method's per-pupil cost runs substantially higher than that of the older method
- The study held constant students' socioeconomic status and prior grades while comparing groups
- The new teaching method has since been adopted by a great many separate school districts nationwide
- Test scores rose at only a small handful of unusually well-resourced elite private academies
- Surveyed students reported that they personally enjoyed the new method considerably more than the old way
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