Question
Please answer 12 13 14 15.
you might not see the number below but it's the last 4
tation interest to the resident ring the The populati a) 781 callerm who phoned in 3sso peopl wampling la of The station's po mpling imple Rampling dents that tion of area poll is to be who In ent imating in the to the many people the 3550 peop who phoned in being far more area residents than na voluntary te due to th c) not d very due to the large proportion of the population ponding 11. experiment having 3 factors with 3 levels each has potent b) 6 c) 9 a) 27 e) none of these a) 3 treatments ror supprension looked uning Drug A alone. Drug B alone Drugs and and a placebo. subjects were assigned A the rour using this to one of M12-114 loss was recorded after 6 nonths. Answer information 12 The response variable is lost: a) the different drugs. c) the amount of weight b) the 6 months taking drug (s) d) er subjects lost weight. 3. The explanatory variable is (s) taken. c) whether there is a placebo effect. a) the drug d) the 6 months the study ran b) weight lost. This is an example of a(n) a) observational study. experiment c) matched-pairs experiment. d) completely randomized bock design. The design of a statistical study is if it does not ystematically favor certain outcomes. a) confounded b) biased c) nonrandom d) unbiased
Explanation / Answer
12. Since it is required to test the treatment of dietary suppression, the response variable is the effect of the drugs given. Hence the response variable is (c) the amount of weight lost. It cannot be D, because weight loss was recorded and not only whether weight was lost or not was recorded.
13. The explanatory variable is (a) the drug(s) taken
14. This is an example of (b) completely randomized experiment.
15. The design of a statistical study is (d) unbiased, if it does not systematically favor certain outcomes
