(Solution) - The operations manager of a plant making cellular telephones has -(2025 Original AI-Free Solution)

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Academic Level: Undergrad. (yrs 3-4)

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The operations manager of a plant making cellular telephones has proposed rearranging the production process to be more efficient. She wants to estimate the time to assemble the telephone using the new arrangement. She believes that the population standard deviation is 15 seconds. How large a sample of workers should she take to estimate the mean assembly time to within 2 seconds with 95% confidence?