Question

(9 points) Chia Pets -- those terra-cotta figurines that sprout fuzzy green hair -- made the chia plant a household name. But chia has gained an entirely new reputation as a diet supplement. In one 2009 study, a team of researchers recruited 38 men and divided them evenly into two groups: treatment or control. They also recruited 38 women, and they randomly placed half of these participants into the treatment group and the other half into the control group. One group was given 25 grams of chia seeds twice a day, and the other was given a placebo. The subjects volunteered to be a part of the study. After 12 weeks, the scientists found no significant difference between the groups in appetite or weight loss.

1. What type of study is this

A. Observational Study
B. Experiment

2. In this study the experimental treatment is  ? chia seeds placebo 12 weeks 38 men 38 women  and the control treatment is  ? chia seeds placebo 12 weeks 38 men 38 women .

3. Blocking  ? has has not  been used in this study. The blocking variable is  ? chia seeds gender volunteer status diet supplement .

4. Has blinding been used in this study?

A. The study is blinded because the subjects do not know if they received the chia seeds or the placebo.
B. The study is not blinded because the researchers know if participants consumed the chia seeds or placebo.
C. The study is blinded because the researchers do not know if participants consumed the chia seeds or placebo.
D. The study is not blinded because the subjects do not know if they received the chia seeds or the placebo.
E. None of the above

5. The study  ? can cannot  be used to establish a causal relationship because the study is an  ? experiment observational study . If the men and the women in the sample are a representative sample, the conclusions  ? can cannot  be generalized to the entire population.

Answer 1