Question: Studies on a machine that molds plastic water pipe indicate that when it is injecting 26.59 mm diameter pipe, the process standard deviation is 0.4

Studies on a machine that molds plastic water pipe indicate that when it is injecting 26.59 mm diameter pipe, the process standard deviation is 0.4 mm. The pipe has a specification of 26.59 mm plus or minus 1.67 mm.

What is the process capability index (Cp)? a. 1.392 b. 4.175 c. 0.6958 d. 2.783

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