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Math Help - Simple proportions from tables

  1. #1
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    Simple proportions from tables

    If you have a two way table of counts (both qualitative variables) using data from a sample, X, and one of the columns is A and one of the rows is B and the question asks:

    What percentage of X were for those who were A and who were B.

    Should you:
    - use the value that is in both A and B and divide it by X or,
    - use all values that are either in A or B (or both) and divide it by X?

    I think it's the second option but I'm not too sure. The wording was really confusing because I thought "and" meant both A and B but I still chose the second for some reason...

    Thanks in advance.
    Last edited by Seber; May 2nd 2011 at 01:22 AM.
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  2. #2
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    The first one, assuming "X" is your sample size.
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