Suppose that in a particular state consisting of four distinct regions, a random sample of nk voters is obtained from the k th region for k = 1,2,3,4 . Each voter is then classified according to which candidate (1, 2, or 3) he or she prefers and according to voter registration (1 = Dem., 2 = Rep., 3 = Indep.) . Let pijkdenote the proportion of voters in region k who belong in candidate category i and registration category j. The null hypothesis of homogeneous regions is as functions of the observed nijk’s, and use the general rule of thumb to obtain the number of degrees of freedom for the chi-squared test.
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