Analysis of the output of a process has suggested that the variability was non-random on several occasions

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Analysis of the output of a process has suggested that the variability was non-random on several occasions recently. However, each time the investigation has not revealed any assignable causes. What are some of the possible explanations for not finding any causes? What should the manager do?
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Operations Management

ISBN: 978-0071091428

4th Canadian edition

Authors: William J Stevenson, Mehran Hojati

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