In a p-chart, the upper control limit is how many estimated standard deviations above the average p-bar?

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In a p-chart, the upper control limit is how many estimated standard deviations above the average p-bar? 

a. 1 

b. 2 

c. 3 

d. 6

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Operations Management

ISBN: 9781260547610

2nd International Edition

Authors: Gerard Cachon, Christian Terwiesch

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