Most experts agree that depression is best treated using a c

Most experts agree that depression is best treated using a combination of medication and therapy. A psychiatrist plans to conduct an experiment to examine the effects of two different types of therapy (cognitive behavioural therapy and psychodynamic therapy) and three different medications (Zoloft, Paxil and Effexor). Effects of therapy and medication are believed to differ depending on the severity of a subject

Solution

Question (a)-(i)

There are two factors in the experiment, one is “different types of therapy”, and the other is “different types of medications”.

Question (a)-(ii)

In this experiment, the treatment is a specific level of factor of interest. Thus, if the factor is medication, the treatments are the different medications (Zoloft, Paxil and Effexor).

Question (a)-(iii)

In this experiment, the “depression” is the response variable.

Question (a)-(iv)

In this experiment, the “medication” is the response variable.

Question- (b)

In this experiment, 180 subjects with mild depression and 120 subjects with severe depression are available for the experiment. At the end of one year, the improvement of each subject’s condition will be evaluated.

Question (c)

No. Because treatment is an effect.