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  • You are forgetting that if you created a normal distribution with the standard deviation and mean you stated, you would have values less than 0–assuming these are continuous measurements. This is why you have a Cpk less than one….you only have a sample with 4 readings in your example which HAPPEN to be all within your specifications.

    Just…[Read more]

  • Hello,

    I´m about to study for my green belt certification. Sorry in advance, I have studied all day and I guess that I´m just doing a very simple mistake. Here it is:

    I made up my own simple example so let´s assume the following data
    Values: 1,2,2,3
    LSL:0
    USL:6
    Mean:2
    S: ~0.7

    If I calculate the cpk, I come up with…[Read more]

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