Question: A control chart can detect a shift in the process mean with a probability of 0.4. How long will it take to detect the shift

A control chart can detect a shift in the process mean

A control chart can detect a shift in the process mean with a probability of 0.4. How long will it take to detect the shift if a sample is collected each 0.5 hour. 2.5 hr b. 1.25 hr c. 1.67 hr d. 0.83 hr

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