Refer to Exercise 9.13. Suppose the new weight- loss agents were of the following form:
A1: Drug therapy with exercise and counseling
A2: Drug therapy with exercise but no counseling
A3: Drug therapy with counseling but no exercise
A4: Drug therapy with no exercise and no counseling
Construct contrasts to make comparisons among the agent means that will address the following:
a. Compare the mean for the standard agent to the average of the means for the four new agents.
b. Compare the mean for the agents with counseling to those without counseling. (Ignore the standard.)
c. Compare the mean for the agents with exercise to those without exercise. ­(Ignore the standard.)
d. Compare the mean for the agents with counseling to the standard.