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a university must study 2.5 hours (150 minutes) per night during the school week. A skeptic suspects that they study less than that on the average.

a university must study 2.5 hours (150 minutes) per night during the school week. ... A skeptic suspects that they study less than that on the average. A class survey finds that the average study time claimed by 244 students is ... Regard these students as a random sample of all first-year students

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