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):

-The number of television sets coming off a production line each day is known to have a standard deviation of 118.5 sets per day.The production manager tells you that the 90% confidence interval for the population mean was 552.3 to 621.9.How large a sample was this confidence interval based on?

Question

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):
 
-The number of television sets coming off a production line each day is known to have a standard deviation of 118.5 sets per day.The production manager tells you that the 90% confidence interval for the population mean was 552.3 to 621.9.How large a sample was this confidence interval based on?

Quizplus · Accepted Answer

The Answer of 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):
 
-The number of television sets coming off a production line each day is known to have a standard deviation of 118.5 sets per day.The production manager tells you that the 90% confidence interval for the population mean was 552.3 to 621.9.How large a sample was this confidence interval based on?