In a Two-Way Contingency Table with Four Rows and Four

Multiple Choice

In a two-way contingency table with four rows and four columns, the appropriate degrees of freedom for the chi-square test statistic is

A) 3,3.
B) 15.
C) 3,12.
D) 9.
E) to determine the appropriate degrees of freedom one must know n, the number of subjects in the experiment.