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How many observations should a time study analyst plan for in an operation that has a standard deviation of 1.9 minutes per piece? The goal

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How many observations should a time study analyst plan for in an operation that has a standard deviation of 1.9 minutes per piece? The goal is to estimate the mean time per piece to within 0.6 minutes, with a confidence of 95.5 percent. (Do not round intermediate calculations. Round up your final answer to the next whole number.)

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