Question: Studies on a machine that molds plastic water pipe indicate that when it is injecting 25.9 mm diameter pipe, the process standard deviation is 0.75

Studies on a machine that molds plastic water pipe indicate that when it is injecting 25.9 mm diameter pipe, the process standard deviation is 0.75 mm. The pipe has a specification of 25.9 mm plus or minus 2.22 mm. What is the process capability index (Cp)?

a.

1.973

b.

0.9867

c.

2.96

d.

0.4933

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