Posted: November 25th, 2022

Brian vanecek, vp of operations at portland trust bank, is evaluating

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 90% confidence interval for the population mean of waiting times is ________. (Points : 4) 
14.27 to 15.73
14.18 to 15.82
9.88 to 20.12
13.86 to 16.14
18.12 to 19.87

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