A p-chart is used to monitor the quality of output of a mechanical part.
The process has been operating with a mean p-bar of 0.02.
An average of 350 units are produced each day and subjected to 100% inspection.
(a) Calculate the control limits based on average daily output.
(b) On one particular day, 22 of the inspected 450 units were rejected.
Was the process operating in control that day?

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Statistical Control

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