Brian Vanecek, VP of Operations at Portland Trust Bank, Is

Multiple Choice

Brian Vanecek, VP of Operations at Portland Trust Bank, is evaluating the service level provided to walk-in customers.Accordingly, his staff recorded the waiting times for 64 randomly selected walk-in customers and determined that their mean waiting time was 15 minutes.Assume that the population standard deviation is 4 minutes.The 95% confidence interval for the population mean of waiting times is ________.

A) 14.02 to 15.98
B) 7.16 to 22.84
C) 14.06 to 15.94
D) 8.42 to 21.58
E) 19.80 to 23.65