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physical depiction -control charts

Six Sigma – iSixSigma Forums Old Forums General physical depiction -control charts

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  • #39967

    Lomax
    Participant

    When we say that control charts are based on 3 sigma limits, what actually we want to say in physical sense??
    Why we normally, i would say always, take 3 sigma limits, knowing that it contains 2700ppm defectives.
    Regards

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    #122912

    MAK
    Participant

    It means that if we assume a distribution of the data to be normal, then the probability of type 1 error is 0.0027, that is, an incorrect out-of-control signal or false alarm will be generated in only 27 out of 10000 points. Simple!!

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