Question: Studies on a machine that molds plastic water pipe indicate that when it is injecting 25.56 mm diameter pipe, the process standard deviation is 0.44

Studies on a machine that molds plastic water pipe indicate that when it is injecting 25.56 mm diameter pipe, the process standard deviation is 0.44 mm. The pipe has a specification of 25.56 mm plus or minus 1.42 mm. What is the process capability index (Cp)?

2.152

3.227

0.5379

1.076

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