Id} Based on your answers to parts 1::- and C, how convinced are you that the new mean waiting time is less than six minutes? _ since 95 percent CI is _ 6 while 99 percent CI cunlnins 6. Recall that 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 ofthe sample of100 bank customer waiting times in Table 1.9 is i = 5.46. If we let}; denote the mean of all possible bank customer waiting times using the new system and assume that 0 equals 2.47: Click here forthe Excel Data File [a] Calculate 95 percent and 99 percent condence intervals for p. (Round your answers to 3 decimal places.) 95 percent condence intervals for p is [ ]. 99 percent condence intervals for p is ]. {b} Using the 95 percent confidence interval, can the bank manager be 95 percent condent that l1 is less than six minutes? _ .aspmmwewans __ (1:) Using the 99 percent condence interval, can the bank manager be 99 percent confident thatp is less than six minutes? _ .sepmmmwauemnds 6