A test for independence is applied to a contingency table with 4 rows and 4 columns. The degrees of freedom for this chi-square test must equal 9.

Name: A test for independence is applied to a contingency table with 4 rows and 4 columns. The degrees of freedom for this chi-square test must equal 9.
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The degrees of freedom for a chi-square test of independence in a contingency table is calculated as (number of rows - 1) * (number of columns - 1). For a 4x4 table, it is (4-1)*(4-1) = 3*3 = 9.

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