medium · GMAT Verbal
Argument: A university recently mandated that all freshmen attend a study skills workshop. One year later, the average GPA of the freshman class was 0.2 points higher than that of the previous year's class. The university administration claimed the workshop was the cause of the academic improvement.
Which of the following would be most useful to evaluate the administration's claim?
- Whether the average GPA of upperclassmen who did not attend the workshop also rose during the same year.
- Whether the study skills workshop was led by faculty members or by senior students.
- Whether freshmen who attended the workshop reported that they found the material useful.
- Whether the university plans to expand the workshop to include sophomores and juniors next year.
- Whether the admission standards for the current freshman class were more rigorous than those for the previous class.
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