A chi-squared test of a contingency table is applied to a contingency table with 4 rows and 4 columns for two qualitative variables.The degrees of freedom for this test must be 9.

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The degrees of freedom for a chi-squared test of a contingency table are calculated as (number of rows - 1) * (number of columns - 1), so for a 4x4 table, it would be (4-1)*(4-1) = 3*3 = 9.

A Chi-Squared Test of a Contingency Table Is Applied to a Contingency