Question: An X control chart with 3-sigma control limits and subgroup size n = 4 has control limits UCL = 48.75 and LCL = 40.55. (a)

An X̅ control chart with 3-sigma control limits and subgroup size n = 4 has control limits UCL = 48.75 and LCL = 40.55.

(a) Estimate the process standard deviation.

(b) Does the response to part (a) depend on whether r or s was used to construct the X̅ control chart?

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