Question: The control limits for an X chart with n = 4 are 12.8 and 24.8, and the PCR for a measurement is 1.33. (a) Estimate

The control limits for an X̅ chart with n = 4 are 12.8 and 24.8, and the PCR for a measurement is 1.33.

(a) Estimate the process standard deviation σ.

(b) Calculate the specification limits. Assume that they are centered around the process mean.

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