A survey is planned to determine the mean annual family medical
Q 8.38 A survey is planned to determine the mean annual family medical expenses of employees of a large company. The management of the company wishes to be 95% confidant that the sample mean is correct to within +-$ 50 of the population mean annual family medical expenses A previous study indicates that the SD is app. $400 a.How large a sample is necessary? b.If […]