The main purpose of a chi-square test is to
A) test the estimated degree of fit (proportion of variance accounted for) of one variable to the other variable.
B) compare the population means to see if they vary from each other more than by chance.
C) compare population variances, to see if they vary from each other more than by chance.
D) test how well the pattern of observed frequencies fits some expected pattern of frequencies.
Answer: D
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