easy · GMAT Verbal

Which new fact most strengthens the conclusion?

1. The result had already been improving at the same rate before the change.
2. Very few of the people measured actually used the change.
3. A separate change occurred at the same time and could explain the result.
4. Patients randomly sent texts missed fewer visits than patients not sent texts.
5. The organization expected the result to improve before collecting any data.

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