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??

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See Answer. 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 sudden and sustained shift in the plots toward the upper or lower control limit. There is an upward trend in the plots.