A college teacher wishes to estimate the mean number of hours worked per week at non-college related jobs by full-time students at the college. He...

A college teacher wishes to estimate the mean number of hours worked per week at​ non-college related jobs by​ full-time students at the college. He desires a margin of error of 1.5 hours. Past studies suggest that a population standard deviation of 14.5 hours is reasonable. Estimate the minimum sample size needed to estimate the population mean with the stated accuracy.