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

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 belng monitored with the chart should be investigated?
Multiple Choice
A large number of plots are close to the upper or lower control lines.
The behavior of the plots is erratic.
A single point falls above or below the control limits.
There is a change in raw materials or operators.
There is a run of five above the central line.
 Quality control charts usually have a central line and upper and

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