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Part C: The way that the study is described indicates that the groups are composed of volunteers. Is this a problem for this study? Yes, because experimental studies should use representative samples. Yes, because volunteers are, by nature, different from most other people No, because the volunteers are all similar in age. ( No, because experiments do not require representative samplesjust similar treatment groups. Part D: Researchers have decided to make the groups as similar as possible by ensuring that they follow diets that limit calories and that all groups exercise similarly. Have they done all they could to limit BMI variability within the groups? Yes, all groups are eating diets with restricted calories. No, aside from ensuring that all volunteers are around 30 years of age, there is no reason to think that there would not be other variability due to things such as gender, weight, etc. No, itis possible that people with lower BMls all end up together in one group. Yes, all groups are getting similar amounts of exercise. Part E: What is the value of limiting variability within each group? () To make changes in BMI easier to identify To minimize confounding variables To control the placebo effect Part F: One way to limit variability in the experiment would be to implement blocking. Which of the following blocking schemes would not help to accomplish this? Create blocks as treatment and control groups. Create blocks by gender Create blocks by age. (2 Create blocks by BMI (such as low, medium, and high BMI blocks}