Question: Other things remaining the same, and assuming that image is smaller than USL and larger than LSL , if the standard deviation ( sigma

Other things remaining the same, and assuming that image is smaller than USL and larger than LSL, if the standard deviation (\sigma ) of the process decreases, process capability index (Cpk) of the process will
I. Stay the same
II. Will always increase
III. Will always decrease
IV. Will sometimes increase

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