A firm would like to estimate the mean age of all people in the civilian labor force.Whatsize samplewould be required to estimate the mean age of all people in the civilian labor force accurate to within 0.75 year of the estimate at the 95% confidence level, given that the population standard deviation is 15.26 years?

a) What is the z-value?

b) What is the margin of error, m?

c) What is the sample size, n?