A clinical psychologist is interested in determining the effectiveness of three different forms of therapy on treating clients with bulimia nervosa. Participants with the diagnosis are randomly assigned to one of the three treatments. After 8 weeks of treatment, they are given the Eating Disorder Inventory-3 (EDI-3) that consists of six subscales: Eating Disorder Risk, Ineffectiveness, Interpersonal Problems, Affective Problems, Overcontrol, and General Psychological Maladjustment. WHich statistical procedure is used?

a. independent sample t test

b. ancova

c. chi square

d. multiple regression

e. manova