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PPM question

Six Sigma – iSixSigma Forums Old Forums General PPM question

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  • #45468

    curious
    Participant

    I have heard the numbers 2 parts per billion for six sigma and 3.4 parts per million for 4.5 sigma.   However, it seems that the 2 parts per billion is based on a two-tail test and the 3.4 parts per million is based on a one-tail test.    Shouldn’t the comparison be between 1 part per billion (6 sigma) and 3.4 PPM (4.5 sigma), both using the one-tail test?

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    #148662

    Joe BB
    Participant

    That’s worse than my posts. Do you have a process that needs to know this?

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