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

Question

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

Quizplus · Accepted Answer

The degrees of freedom for the interaction between diet and gender depend on the number of levels of each factor. In this case, there are 3 levels of diet (solid, liquid, control) and 2 levels of gender (male, female), so the interaction has 2 degrees of freedom (3-1)*(2-1).

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