Choosing an appropriate sample size A union of restaurant and foodservice workers would like to estimate the mean hourly wage, , of foodservice...

Choosing an appropriate sample sizeA union of restaurant and foodservice workers would like to estimate the mean hourly wage, , of foodservice 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 confident that its estimate is within of ? Suppose that the standard deviation of wages of foodservice workers in the U.S. is about .