A random sample of 82 customers,who visited a department store,spent an average of $71 at this store.Suppose the standard deviation of expenditures at this store is = $19.The 98% confidence interval for the population mean (rounded to two decimal places)is:

Question

A random sample of 82 customers,who visited a department store,spent an average of $71 at this store.Suppose the standard deviation of expenditures at this store is  = $19.The 98% confidence interval for the population mean (rounded to two decimal places)is:

Quizplus · Accepted Answer

The Answer is Part A: The lower limit is $66.11 Part B: The upper limit is $75.89

A Random Sample of 82 Customers,who Visited a Department Store,spent