Question: Studies on a machine that molds plastic water pipe indicate that when it is injecting 28.68 mm diameter pipe, the process standard deviation is 0.43

Studies on a machine that molds plastic water pipe indicate that when it is injecting 28.68 mm diameter pipe, the process standard deviation is 0.43 mm. The pipe has a specification of 28.68 mm plus or minus 2.15 mm. What is the process capability index (Cp)?

a. 0.8333

b. 3.333

c. 1.667

d. 5

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