Question: Studies on a machine that molds plastic water pipe indicate that when it is injecting 29.87 mm diameter pipe, the process standard deviation is 0.93

Studies on a machine that molds plastic water pipe indicate that when it is injecting 29.87 mm diameter pipe, the process standard deviation is 0.93 mm. The pipe has a specification of 29.87 mm plus or minus 0.89 mm. What is the process capability index (Cp)?

a.

0.957

b.

0.638

c.

0.319

d.

0.1595

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