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Mathematics, 18.12.2019 19:31 mulan8382
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 . 14.02 to 15.98b. 7.16 to 22.84c. 14.06 to 15.94d. 8.42 to 21.58e. 19.80 to 23.65
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