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GMAT
GMAT Verbal Reasoning Section

Identifying Flawed Causation in Educational Study

Easy Critical Reasoning Identifying Flaws

In a recent study, researchers concluded that since a high percentage of students who attend after-school tutoring sessions have higher test scores than those who do not, after-school tutoring must be beneficial for improving academic performance. However, the researchers did not consider that students who attend tutoring may already be more motivated or possess greater academic ability compared to their peers who do not.

Which of the following best describes the flaw in the researchers' argument?

Hint

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