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For several years, a mathematics placement test had been administered to all incoming freshmen at a certain college. If 64 students, randomly selected over this

For several years, a mathematics placement test had been administered to all incoming freshmen at a certain college. If 64 students, randomly selected over this period of time, took on an average of 28.5 minutes to complete the test with a variance of 9.3 minutes, construct a 99% confidence interval for the true average time it takes a freshman to complete the test.

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