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What is the formula for process capability index?

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What is the formula for process capability index?

(a) (1-K)Cp

(b) (1+K)Cp

(c) (1-Cp)K

(d) (1+Cp)K

I had been asked this question in exam.

My doubt is from Tools and Techniques of TQM in section Measuring Machines & Total Quality Management of Engineering Metrology

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Right option is (a) (1-K)Cp

Explanation: Process capability index is also known as measure of process capability and denoted by Cpk. Cpk  = (1-K)*Cp. K is the correction factor and always has a positive value. Cp is the process capability potential also known as process capability variation and is equal to the (Specification width divided by process width).

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