(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 extends6. Recall that a bank manager has developed a new system to reduce the time customers spend wanting to be served by tellersduring peak business hours. The mean waiting time during peak business hours under the current system is roughly 9 to 10minutes. The bank manager hopes that the new system will have a mean waiting time that is less than six minutes. The mean ofthe sample of 90 bank customer waiting times is = 5.43. If we let u denote the mean of all possible bank customer waitingtimes using the new system and assume that o equals 2.49(a) Calculate 95 percent and 99 percent confidence intervals for u. (Round your answers to 3 decimal places.)95 percent confidence intervals for u is99 percent confidence intervals for u isI(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 is6

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minutes. The bank manager hopes that the new system will have a mean waiting time that is less than six minutes. The mean of ystem is roughly 9 to 10 the sample of 90 bank customer waiting times is 25.43. If we let u denote the mean of all possible bank customer waiting times using the new system and assume that a equals 2.49 (a) 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 u is (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