The number of degrees of freedom in testing for independence when using a contingency table with 6 rows and 4 columns is:
A) 24
B) 10
C) 15
D) 20
E) 12

Question

Quizplus · Accepted Answer

The formula for degrees of freedom in a contingency table is df=(r-1)(c-1), where r is the number of rows and c is the number of columns. Substituting r=6 and c=4 into the formula, we get df=(6-1)(4-1)=15. Therefore, the answer is C.

The Number of Degrees of Freedom in Testing for Independence