medium · GRE Verbal
Students who scored unusually low on a diagnostic test were placed in a new tutoring program, and most scored higher on the retest a month later. The program's director cites this as proof the tutoring worked, without addressing that unusually low scores tend to rise toward the average on a retest even without any intervention. Which statement can be properly inferred from the passage?
- The tutoring program had no measurable effect on any student's score
- The retest scores would have been identical without the tutoring program
- The score increase alone does not establish that the tutoring program caused it
- Every student who scored low initially will always regress toward the average no matter how the initial diagnostic score was distributed among students
- The diagnostic test used to select students was poorly designed
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