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Sample size for variable atribute data

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  • #43844

    AJ
    Participant

    Hello everyone:
    During “validation” runs I have had customers asked me to pull 60 pieces to collect variable data out of my production runs independent on the amount of pieces that one of this daily runs can produce. The claim being that 60 or more will give me a 95% confidence level that any process information infered from the data will be true. For atribute data I been asked to pull a minimum of 300 units out of my lots, independent of the lot size.
    Can someone out there explain if this is true? Your help is appreciatted
    AJ
     

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    #139888

    Alexander S.O.
    Participant

    AJ, I think you can obtain the 95% confidence in your data using a military standard to obtain your sample, for example using a MIL STD 105D you need to adjust your Acceptance Quality Level, define your inspection level and it works using your lot size.

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    #139891

    DANG Dinh Cung
    Participant

    Good morning,
    For attribute data you may refer to ANSI/ASQC Z1.4-1993 or ISO 2859 and for variable data to ISO 3951.
    Best regards,
    DANG Dinh [email protected]
     

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