A 2 * 2 chi-square test for independence has 4 degrees of freedom.

Name: A 2 * 2 chi-square test for independence has 4 degrees of freedom.
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A 2x2 chi-square test for independence has 1 degree of freedom. More specifically, for a chi-square test for independence with r rows and c columns, the degrees of freedom equal (r-1)x(c-1). Therefore, for a 2x10 chi-square test for independence, the degrees of freedom would be (2-1)x(10-1) = 9.

A 2 * 2 Chi-Square Test for Independence Has 4