You are trying to increase the number of socially appropriate comments being used in a 30-minute session. Relative to treatment as usual (i.e., no treatment) control group, Treatment A shows a Cohen's d of 1.3. What does this tell you?

Select one or more:

a. Response in Treatment A is more variable than in the treatment group.

b. The average number of socially appropriate utterances in the Treatment A group is 1.3 SD higher than the average in the control group.

c. Treatment A has a relatively small clinical effect.

d. Treatment A is more effective than treatment as usual.