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A sleep study wants to examine the sleep habits of college students. Assume that based on passed studies, the population standard deviation is 1.8 hours

A sleep study wants to examine the sleep habits of college students. Assume that based on passed studies, the population standard deviation is 1.8 hours per night. Calculate the minimum sample size needed to construct a 95% confidence interval estimate of the population mean sleep time of college students, with a 0.40 hour margin of error(maximum error).

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