Question: In the formula for the C p index, why does the term 6 in the denominator imply that this index equals 1 for a 3-sigma

In the formula for the Cp index, why does the term 6 in the denominator imply that this index equals 1 for a "3-sigma" process and equals 2 for a "6-sigma" process? You can assume that the mean of the process is midway between LSL and USL.

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The numerator for C p is the difference between the specification limits USL LSL By definition ... View full answer

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