Question


(p. 327) Quality control charts usually have a central line and upper and lower control limit lines. Which of the following are reasons that the process being monitored with the chart should be investigated?

A. A single plot falls above or below the control limits

B. Normal behavior

C. A large number of plots are on or near the central line

D. No real trend in any direction

E. A change in raw materials or operators

Answer

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