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Evaluating a Free Tuition Policy
A state introduces a new policy offering free college tuition to all high school graduates with a final GPA of 3.50 or higher. To evaluate the policy's impact, an economist compares the college enrollment rates of students with GPAs just above 3.50 (e.g., 3.50-3.55) to those with GPAs just below 3.50 (e.g., 3.45-3.49). What is the single most critical assumption the economist must make about these two groups of students for the study's findings to be considered valid?
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