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Need Help with Ppk Calculation

Six Sigma – iSixSigma Forums General Forums Tools & Templates Need Help with Ppk Calculation

This topic contains 5 replies, has 4 voices, and was last updated by  Ddelisle 1 week, 2 days ago.

Viewing 6 posts - 1 through 6 (of 6 total)
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  • #240339

    Ddelisle
    Participant

    Hi-

    I did research on the Ppk calc. in the forum but did not see anything that would help me with this question.  This is a practice exam question.

    “What is the Ppk of a process with a spread of 24 units, an average of 68, upper limit of 82 and lower limit of 54.

    A) 1.68

    B) 2.00

    C) 4.00

    D) 4.42

    Test service claims the correct answer to be “C”.

    I am coming up with 1.17  based on this formula: Min((Xbar-LSL)/3*std dev), (USL-Xbar)/(3*std dev))

    Assuming Std dev = spread/6

    What am I missing?

    Thanks!

     

     

     

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    #240341

    Robert Butler
    Participant

    It looks to me like they’ve screwed up again.  Answer C is the estimate of the standard deviation (24/6).  Your calculations are correct.

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    #240344

    Ddelisle
    Participant

    Thank you Robert…

     

     

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    #240346

    Chris Seider
    Participant

    Are bots coming up with these questions or someone without basic math skills?  Crazy.

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    #240349

    Mike Carnell
    Participant

    @Ddeliste Will you tell us where you got the test questions please.

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    #240351

    Ddelisle
    Participant

    Hello all..

    Test questions are coming from Prepaway LSSBB premium exam

     

     

     

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