A bank manager has developed a new system to reduce the time customers spend waiting to be served by tellers during peak business hours. The mean waiting time during peak business hours under the current system is roughly 9 to 10 minutes. The bank manager hopes that the new system will have a mean waiting time that is less than six minutes. The mean of the sample of 100 bank customer waiting times is 5.46 and the population standard deviation is 2.47 a. Calculate 95% and 99% confidence intervals 5.46 . Using the 95% confidence interval, can the bank manager be 95% confidence that is less than six minutes? Explain . Using the 99% confidence interval, can the bank manager be 99% confident that is less than 6 minutes? Explain