Weight Loss A health instructor, who believes that weight training is better than cardio for weight loss, divides a bunch of obese people into two groups: one group is assigned to weight training while the other is assigned to cardio. After six months, the participants are assessed to measure the effectiveness of both the exercise regimens on their weight loss.

a. The health instructor is concerned that the health of the highly obese people will deteriorate if they do not start weight training and thus assigns them to the weight training group. Explain why this will affect his ability to determine which exercise regimen works best.

b. What suggestion would you give the health instructor to improve his experiment?

c. The health instructor asks the personal trainers whether it is advisable for him to know which exercise regimen each individual follows and to assess them himself at the end of the experiment to rate their improvement. Explain why this practice will affect his ability to determine which approach works best.

d. What improvements to the plan in part c do you recommend?