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12. A manager is interested in estimating the mean time (in minutes) required to complete a job. His assistant uses a sample of 100 observations

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12. A manager is interested in estimating the mean time (in minutes) required to complete a job. His assistant uses a sample of 100 observations to report the confidence interval as [14.355, 17.645]. The population standard deviation is known to be equal to 10 minutes. a. Find the sample mean time used to compute the confidence interval. b. Determine the confidence level used for the analysis

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