You intend to conduct a test of independence for a contingency table with 4 categories in the column variable and 4 categories in the row variable. You collect data from 380 subjects. What are the...

You intend to conduct a test of independence for a contingency table with 4 categories in the column variable and 4 categories in the row variable. You collect data from 380 subjects.


What are the degrees of freedom for the χ2 distribution for this test?
d.f. =