medium · GMAT Verbal
A university's admissions office noticed that students who submitted optional letters of recommendation had, on average, higher first-year GPAs than students who did not submit such letters. The office concluded that requiring all applicants to submit letters of recommendation would raise the average first-year GPA of the incoming class.
Which of the following is an assumption on which the admissions office's conclusion depends?
- Stronger students are not simply the ones already more likely to have submitted these letters too.
- Faculty who write recommendation letters are generally honest about their students' abilities.
- The admissions committee reads every recommendation letter carefully before deciding on an applicant.
- Requiring these letters will not shrink the total pool of students who choose to apply to the school.
- Every student who once submitted a recommendation letter was in fact admitted to the university.
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