Question: On average, how many units will be produced until the control chart signals that the process is out of control when it is under control?

On average, how many units will be produced until the control chart signals that the process is out of control when it is under control?

A production facility produces 100 units per hour and uses an x chart to monitor its quality. The control limits are set at 3 standard errors from the mean. When the process goes out of control, it usually shifts the mean by 1.5 standard deviations. Sampling is conducted once per hour with a sample size of 3.

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