A bank manager wants to determine the percent of time that tellers are working and idle. She

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A bank manager wants to determine the percent of time that tellers are working and idle. She decides to use work sampling, and her initial estimate is that the tellers are idle 30 percent of the time. How many observations should the manager take in order to be 95 percent confident that the results will not be more than 2.5 percent away from the true result?


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Operations management

ISBN: 978-0132163927

10th edition

Authors: Jay Heizer, Barry Render

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