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Estimating Scraps in a Manufacturing

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    		•
    Posted by: vaza
    Posted on: Wednesday, 21st October 2009, 9:50 AM.


    First calculate ZL using minitab.

    Calc>prob distr.normal> enter the mean> enter the SD and activate the input constant > enter LS.

    Do the same with the USL.

    The outcome ZL= 0.0000015

    ZU=0.977250

    Since this is the Lower Spec Limit and Minitab gives us the area to the
    left of the specified value, this will be the proportion that is below the
    lower spec limit.  It is not necessary to subtract this result from 1.0.
     
     
    This is the Upper Spec Limit.  Minitab provides us with the area under
    the curve to the left of this value.  We need the area to the right (above
    the spec limit), so we must subtract from 1.0.

    This makes : 1-0.977250 =0.02275

    Totaal 0.02275+0.0000015=0.0227515

    Scrap : 0.0227515*652=14.83

     Message Thread:
      Estimating Scraps in a Manufacturing by Liliane on Thursday, 15th October 2009
           Re: Estimating Scraps in a Manufacturing by vaza on Wednesday, 21st October 2009

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