An Experiment Has Been Designed to Study the Effectiveness of a New

Multiple Choice

An experiment has been designed to study the effectiveness of a new diet on weight gain for use with
anorexic individuals. The diet is available in both a solid and a liquid form.
The two new diets and a standard control diet were randomly assigned to 15 women and 15 men. Thus,
each of the 3 diets was assigned to 5 men and 5 women. The weight gains attained after 12 weeks were
recorded for each of the participants and the corresponding averages are summarized in the following
B B'
-The degrees of freedom for the interaction between diet and gender are:

A) 1
B) 2
C) 3
D) 4