Question: Studies on a machine that molds plastic water pipe indicate that when it is injecting 25.4 mm diameter pipe, the process standard deviation is 0.34

Studies on a machine that molds plastic water pipe indicate that when it is injecting 25.4 mm diameter pipe, the process standard deviation is 0.34 mm. The pipe has a specification of 25.4 mm plus or minus 2.36 mm. What is the process capability index (Cp)?

a. 4.627 b. 1.157 c. 2.314 d. 6.941

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