THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION

Essay

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
A regional CPA firm conducted an audit for a discount chain.One part of the audit involved developing an estimate for the mean dollar error in total charges that occur during the checkout process.They wish to develop a 90% confidence interval estimate for the population mean.A simple random sample of n = 20 is selected,with the following data (in dollars):

-In a recent survey of personnel directors,71% thought that they should hire new personnel over the next three months.The researcher conducting the survey reported that the 99% confidence interval for the proportion of all personnel directors planning to hire personnel over the next three months was from 0.68 to 0.74.What is the sample size taken by the researcher?