Question: Studies on a machine that molds plastic water pipe indicate that when it is injecting 25.58 mm diameter pipe, the process standard deviation is 0.35

Studies on a machine that molds plastic water pipe indicate that when it is injecting 25.58 mm diameter pipe, the process standard deviation is 0.35 mm. The pipe has a specification of 25.58 mm plus or minus 1.5 mm. What is the process capability index (Cp)?

4.286

2.857

0.7143

1.429

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