If we use the χ² analysis to test for the differences among 4 proportions, the degrees of freedom are equal to ________.
A) 3
B) 4
C) 5
D) 1

Question

Quizplus · Accepted Answer

The degrees of freedom for a chi-square test of independence with (r-1)(c-1) degrees of freedom, where r is the number of rows and c is the number of columns in the contingency table. In this case, we have 4 proportions, so we have 3 rows and 1 column, giving us (3-1)(1-1) = 2 degrees of freedom.

If We Use the χ² Analysis to Test for the Differences