Question: Quality, Inc., is attempting to determine whether an existing machine is capable of milling an engine part that has a key specification of 4 .003

Quality, Inc., is attempting to determine whether an existing machine is capable of milling an engine part that has a key specification of 4 .003 inches. After a trial run on this machine, C-Spec has determined that the machine has a sample mean of 4.001 inches with a standard deviation of .001 inch.

1 Calculate the Cpk for this machine.

2 Should C-Spec use this machine to produce this part? Why?

3 How could we improve the process capability?

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