easy · GMAT Verbal
A school offered free tutoring and pass rates rose. Administrators conclude that tutoring improved pass rates.
Which new fact most strengthens the conclusion?
- The result had already been improving at the same rate before the change.
- Very few of the people measured actually used the change.
- Students who regularly attended tutoring improved more than similar nonattendees.
- A separate change occurred at the same time and could explain the result.
- The organization expected the result to improve before collecting any data.
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