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How do I calculate the following: How many observations should a time study analyst plan for in an operation that has a standard deviation of 1.

How do I calculate the following: How many observations should a time study analyst plan for in an operation that has a standard deviation of 1.3 minutes per piece if the goal is to estimate the mean time per piece to within .6 minute 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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