Question

Quality control charts usually have a central line and upper and lower control limit lines. Which of the following is not a reason that the process being monitored with the chart should be investigated?
A. A large number of plots are close to the upper or lower control lines
B. Erratic behavior of the plots
C. A single plot falls above or below the control limits
D. A change in raw materials or operators
E. A run of five above the central line

Answer

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