1. An experienced operator has operated a machine over several days, being careful to keep assignable causes...

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1. An experienced operator has operated a machine over several days, being careful to keep assignable causes of variation absent from the process. Twenty-five random samples of n = 6 were taken during this time, and 2X = 75.186 cm and ZR = 4.270 cm.

Compute control limits for X and R that are 3 standard deviations from their expected value. Assume the process mean was correctly set.

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