Question about Process Capability Index
A component has a specification of 12 cm with a permitted tolerance of .015 cm and the process that produces it has an inherent standard deviation of .002 cm. Which of the following is true?
a. The Process Capability Index is 2.5
b. This is an example of "Gold Plating"
c. The Voice of the Process exceeds the Voice of the Customer
d. All are true
According the mock test of my PMP class, the right answer is d... I agree with answers b and c, but I cannot find the process capability index 2.5... I don't remember about this index during class, I tried some formulas found in the Internet but it is like something is missing. Hopefully someone here feels comfortable to help me, that would be greatly appreciate, thanks!