a) Calculate the 3-sigma control limits for the X-bar and R control charts
b) If the mean of the process shifts to 347 lb the next day, compute the probability that the shift will not be detected on the X-bar chart on the first subgroup plotted after the shift takes place. Assume no change in Ợ
c) Assuming normal distribution of process output, what proportion of nonconforming units would be produced at this new value of the mean.
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