A business school placement officer wants to estimate the mean annual salaries of the school's former students
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A business school placement officer wants to estimate the mean annual salaries of the school's former students 5 years after graduation. A random sample of twenty-five such graduates found a sample mean of $42.740 and a sample standard deviation of $4,780. Assuming that the population distribution is normal, find a 90% confidence interval for the population mean.
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