Question: An X control chart with 3-sigma control limits and subgroup size n = 4 has control limits UCL = 28.8 and LCL = 24.6. The

An X control chart with 3-sigma control limits and subgroup size n = 4 has control limits UCL = 28.8 and LCL = 24.6. The process specification limits are (24, 32).

(a) Estimate the process standard deviation.

(b) Calculate PCR and PCR_k for the process.

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