Question: Studies on a machine that molds plastic water pipe indicate that when it is injecting 1 -inch-diameter pipe, the process standard deviation is 0.05 inches.

Studies on a machine that molds plastic water pipe indicate that when it is injecting 1 -inch-diameter pipe, the process standard deviation is 0.05 inches. The 1 -inch pipe has a specification of 1 inch plus or minus 0.10 inch. What is the process capability index (Cpk) if the long-run process mean is 1 inch? 0.67 0.50 1.00 2.20 2.00

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