Quality control charts usually have a central line and upper and lower control limit lines. Which of
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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 sudden and sustained shift in the plots toward the upper or lower control limit | |
b. | There is an upward trend in the plots | |
c. | A large number of plots are on or near the central line | |
d. | A single plot falls outside of the control limits |
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