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Nick Petritis, Operations Manager with the Palmerston North Trust Bank, is evaluating the service level provided to walk-in customers. Accordingly, his staff recorded the waiting
Nick Petritis, Operations Manager with the Palmerston North 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:
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