Write a brief report comparing the sampling plans described in Exercises 21.16 and 21.19. Discuss the relative

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Write a brief report comparing the sampling plans described in Exercises 21.16 and 21.19. Discuss the relative costs of the two plans and the frequency of Type I and Type II errors.


A production facility produces 100 units per hour and uses an x̅ 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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