When deciding on the critical value for the chi-square test, one must first decide whether to use a one-tailed or two-tailed hypothesis test.

Question

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The decision on whether to use a one-tailed or two-tailed hypothesis test is based on the research question and the directionality of the effect being tested. It does not affect the choice of critical value, which is determined by the significance level and degrees of freedom.

When Deciding on the Critical Value for the Chi-Square Test