iSixSigma

Sampling Size

This topic contains 1 reply, has 2 voices, and was last updated by  Robert Butler 2 months ago.

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  • #56111

    Abimbola Alege
    Participant

    Please, how do I calculate the sampling size for a factory that produces 1200 units per hour and works 16 hours/day and assumes it runs 5 days a week.

    Recent failure from one’s week production shows 0.5% defect

    Thanks

    #203112

    Robert Butler
    Participant

    If this isn’t a homework problem it certainly sounds like one. In either case no one can offer anything because you have not provided enough information. You need to tell us what it is that you are trying to do. For example – confidence interval around the defect size, detection of a shift in defect size due to process change, etc. …and then there is the issue of precision – alpha and beta levels and why you need those at the level you have chosen.

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