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?

Multiple Choice

  • Seven or more plots are trending toward the upper control limit

  • No plots fall above or below the control limits

  • A large number of plots are on or near the central line

  • Plots are evenly distributed a small distance above and below the center-line

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