Question: Suppose that a 3-sigma control chart is used. What is the probability that when the process is in control, the first eight points plotted lie

Suppose that a 3-sigma control chart is used. What is the probability that when the process is in control, the first eight points plotted lie on the same side of the center line but within the control limits? Do you think that this should be taken as evidence that the process has moved out of control?

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