Question: Spec Inc is attempting to determine whether an existing machine is capable of milling an engine part that has a key specification of 4 +-

Spec Inc is attempting to determine whether an existing machine is capable of milling an engine part that has a key specification of 4 +- 0.005. After a trial run on this machine, the company has determined that the machine has a sample mean of 4.002 inches with a standard deviation of 0.002 inch.

Calculate the process capability index.

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