Calculate a 90 confidence interval for the population mean., Ask an Expert

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The average years of employee experience at any company is normally distributed, with a standard deviation of 12 years. If a sample of 50 employees indicates a mean age is 38 year.

a) find out a 90% confidence interval for the population mean.

b) How many employees should we sample if we want to change the ME to 2.5 with 90% confidence?

c) find out a 99% confidence interval for the population mean.

d) How many employees should we sample if we want to change the ME to 3.9 with 99% confidence?

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