A normal population has a standard deviation of 15. How large a sample should be drawn to estimate the population mean to within 1.5 with 95% confidence?

Name: A normal population has a standard deviation of 15. How large a sample should be drawn to estimate the population mean to within 1.5 with 95% confidence?
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The Answer of A normal population has a standard deviation of 15. How large a sample should be drawn to estimate the population mean to within 1.5 with 95% confidence?

A Normal Population Has a Standard Deviation of 15