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A professor wants to estimate how many hours per week students study. A simple random sample...

A professor wants to estimate how many hours per week students study. A simple random sample of 78 students had a mean of 15.0 hours of studying per week. Construct and interpret a 90% confidence interval for the mean number of hours a student studies per week. Assume the population standard deviation is known to be 2.3 hours per week

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