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3.4 DPPM is a z-score of 4.6?

Six Sigma – iSixSigma Forums General Forums General 3.4 DPPM is a z-score of 4.6?

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  • #257217

    BobMoreland
    Participant

    Why is it that 3.4 DPPM registers as a z-score of 4.6? Is Six Sigma using a different z chart?

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    #257450

    Ken Feldman
    Participant

    Check out something referred to as the 1.5 sigma shift. There has been much debate on this site as to the source and validity of the concept. It will explain why the traditional 3.4 defects per million definition of 6 sigma shows up in the Z table as 4.5 sigma and not 6.

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