# Sample size calculation

A union of restaurant and food service workers would like to estimate the mean hourly wage, , of food service workers in the U.S. The union will choose a random sample of wages and then estimate using the mean of the sample. What is the minimum sample size needed in order for the union to be 90% confident that its estimate is within $0.50 of ? Suppose that the standard deviation of wages of food service workers in the U.S. is about $2.15.

Carry your intermediate computations to at least three decimal places. Write your answer as a whole number (and make sure that it is the minimum whole number that satisfies the requirements).

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#### Solution Summary

This solution gives the step by step method for computing sample size for estimating population mean.

$2.19