Question: When a 3 - sigma control chart is used, what is the average run length when the process is in control? In other words, if

When a

3 -

sigma control chart is used, what is the average run length when the process is in control? In other words, if the process is in control, what is the expected number of points plotted on the control chart until one of them lies outside the control limits and provides the false indication that the process has moved out of control?

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