Question: Quality control charts have a central line and upper and lower control lmit lines. Which of the following is a reason to investigate the process?

Quality control charts have a central line and
Quality control charts have a central line and upper and lower control lmit lines. Which of the following is a reason to investigate the process? No real trend in any direction A large number of plots are on or near the central line A large number of plots fall above the upper control limit or below the lower controllimit Normal behavior A change in raw materials or operators

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