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 of the sample of 93 bank customer waiting times is 2-5.44. If we let udenote the mean of all possible bank customer waiting times using the new system and assume that o equals 2.44 (e) Calculate 95 percent and 99 percent confidence intervals for . (Round your answers to 3 decimal places.) 95 percent confidence intervals for u is 99 percent confidence intervals for p in (b) Using the 95 percent confidence interval, can the bank manager be 95 percent confident that is less than six minutes? Explain 95 percent interval is 6 (e) Using the 99 percent confidence interval, can the bank manager be 99 percent confident that is less than six minutes? Explain 99 percent interval extends

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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 of the sample of 93
bank customer waiting times is 2-5.44. If we let udenote the mean of all possible bank customer waiting times using the new system
and assume that o equals 2.44:
(a) Calculate 95 percent and 99 percent confidence intervals for u. (Round your answers to 3 decimal places.)
95 percent confidence intervals for p is
99 percent confidence intervals for u in
(b) Using the 95 percent confidence interval, can the bank manager be 95 percent confident that is less than six minutes? Explain.
95 percent intervalis
16
(c) Using the 99 percent confidence interval, can the bank manager be 99 percent confident that is less than six minutes? Explain
99 percent interval extends
6
Transcribed Image Text: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 of the sample of 93 bank customer waiting times is 2-5.44. If we let udenote the mean of all possible bank customer waiting times using the new system and assume that o equals 2.44: (a) Calculate 95 percent and 99 percent confidence intervals for u. (Round your answers to 3 decimal places.) 95 percent confidence intervals for p is 99 percent confidence intervals for u in (b) Using the 95 percent confidence interval, can the bank manager be 95 percent confident that is less than six minutes? Explain. 95 percent intervalis 16 (c) Using the 99 percent confidence interval, can the bank manager be 99 percent confident that is less than six minutes? Explain 99 percent interval extends 6
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