Question: Quality control charts usually have a central line and upper and lower control limit lines. Which of the following is a reason that the process
Quality control charts usually have a central line and upper and lower control limit lines. Which of the following is a reason that the process being monitored with the chart should be investigated?
A) Plots are evenly distributed a small distance above and below the center line
B) A large number of plots are on or near the central line
C) Seven or more plots are trending toward the upper control limit
D) No plots fall above or below the control limits
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