iSixSigma

help!

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  • #30342

    anon
    Participant

    Anybody know what the term “population of inference” means?

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    #78913

    I Yi Yi
    Participant

    I think it is when someone tries to create a glossary terms to feel important?  Not sure though?

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    #78916

    Ropp
    Participant

    Hi,
    In statistics, you often take a sample and then, based on your analysis of that sample, make some type of decision about units that were not sampled.  For example, in receiving inspection, a shipment of 1,000 parts is received.  An inspector may take a sample of 30 (hopefully, randomly), and measure some quality characteristic of these 30.  If all 30 measurements are acceptable, he or she will decide to accept the entire lot, even though 970 units have not been checked.
    Thus, based on the sample results, the inspector concludes, or infers, that the remainder of the lot is also good.  The 30 tested pieces are the sample, the other 970 pieces are the “population of inference,” the units onto which we want to extend the conclusions reach by our analysis of the sample units.  This is why it is so important that a random and representative sample is taken.  A sample of 30 pieces from only the top layer of the shipment may not accurately reflect the quality of the parts on the middle or bottom layers.
    Hope this helps.

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