A what are the control limits for x-bar control charts with

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a) What are the control limits for X-bar control charts with \alpha = 0.002 probability limit and sample size of 4?

b) Assume the mean shift is 1.5sigma(sigma is the process standard deviation, that is, the standard deviation of individual observations), what is the probability of type II error under this mean shift?

Reference no: EM13627004

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