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Question 685:

NKU needs to estimate the mean number of hours that all students work to earn money, on average, per week during the full semesters (fall and spring). Previous studies indicate that the standard deviation among the hours worked per week among all NKU students during full semesters is 6.4 hours. How many students should be asked for their weekly work hours in order to estimate the value of interest within a margin of error of 1.5 hours using 95% confidence?

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