A chi-square test of independence is applied to a contingency table with 4 rows and 5 columns for two qualitative variables. The degrees of freedom for this test will be:
A) 20
B) 16
C) 15
D) 12
E) 9

Question

Quizplus · Accepted Answer

The degrees of freedom for a chi-square test of independence is calculated as (number of rows - 1) * (number of columns - 1). For a table with 4 rows and 5 columns, this is (4-1)*(5-1) = 3*4 = 12.

A Chi-Square Test of Independence Is Applied to a Contingency