Question: Studies on a machine that molds plastic water pipe indicate that when it is injecting 28.97 mm diameter pipe, the process standard deviation is 0.42

Studies on a machine that molds plastic water pipe indicate that when it is injecting 28.97 mm diameter pipe, the process standard deviation is 0.42 mm. The pipe has a specification of 28.97 mm plus or minus 1.4 mm. What is the process capability index (Cp)?

a. 1.111 b. 2.222 c. 3.333 d. 0.5556

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