The feature common to both anorexia nervosa and bulimia nervosa is
a) refusal to maintain normal body weight
b) fear of gaining weight
c) purging to prevent weight gain
d) none of the above
Question 2
What is the value of using an ABAB design?
A) Generalizability is ensured.
B) Subjects can be selected randomly.
C) The effects of a single form of treatment are studied twice in the same subject.
D) It permits the study of the effects of multiple forms of treatment on a single subject.