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Hello, please explain your solution if possible. Thank you! To estimate the average daily down time (in minutes) for a manufacturer, a random sample of

Hello, please explain your solution if possible. Thank you!

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To estimate the average daily down time (in minutes) for a manufacturer, a random sample of 25 days of production records is selected. The mean and the variance were found to be 49.75 and 53.29, respectively. minutes. What is the upper limit of the 98% confidence interval estimator for the population mean

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