Answer Happy

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 99% confident that the sample mean is correct to within a $50 of the population mean annual family medical expenses. A previous study indicates that the standard deviation is approximately $454 a How large a sample is necessary? b. If management wants to be comect to within a $30, how many employees need to be selected? Click here to view page 1 of the cumulative standardized normal distribution table Click here 30.view pre 2 of the cumulative standardized normal disordion table How large a sample is necessary? (Round up to the nearest integer) b. If management wants to be correct to within 330, how many employees need to be selected? (Round up to the nearest indeger) no