How many observations should a stopwatch time study analyst plan for in an operation that has a

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How many observations should a stopwatch time study analyst plan for in an operation that has a standard deviation of 1.5 minutes per piece if the goal is to estimate tire mean time per piece to within .4 minute with a confidence of 95.5 percent?
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Operations Management

ISBN: 978-0071091428

4th Canadian edition

Authors: William J Stevenson, Mehran Hojati

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