(Solution) - The operations manager of a large production plant would like -(2025 Original AI-Free Solution)

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Academic Level: Undergrad. (yrs 3-4)

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The operations manager of a large production plant would like to estimate the average amount of time workers take to assemble a new electronic component. After observing a number of workers assembling similar devices, she guesses that the standard deviation is 6 minutes. How large a sample of workers should she take if she wishes to estimate the mean assembly time to within 20 seconds? Assume that the confidence level is to be 99%.