(3 points) For each problem, select the best response. (a) What electrical chang
ID: 2926070 • Letter: #
Question
(3 points) For each problem, select the best response. (a) What electrical changes occur in muscles as they get tired? Student subjects hold their arms above their shoulders until they have to drop them. Meanwhile, the electrical activity in their arm muscles is measured. This is A. an experiment with no control group. B. an observational study. O C. a randomized comparative experiment. D. None of the above. (b) A marketing class designs two videos advertising an expensive Mercedes sports car. They test the videos by asking fellow students to view both (in random order) and say which makes them more likely to buy the car. Mercedes should be reluctant to agree that the video favored in this study will sell more cars because ·A" results from students may not generalize to the older and richer customers who might buy a Mercedes. B. the study used matched pairs design instead of a completely randomized design. c. this is an observational study, not an experiment. D. None of the above. (c) Can changing diet reduce high blood pressure? Vegetarian diets and low-salt diets are both promising. Men with high blood pressure are assigned at random to one of four diets: (1) normal diet with unrestricted salt, (2) vegetarian with unrestricted salt, (3) normal with restricted salt, and (4) vegetarian with restricted salt. This experiment has A.two factors, normal/vegetarian diet and unrestricted/restricted salt. B. one factor, the choice of diet. C. four factors, the four diets being compared D. None of the above.Explanation / Answer
Solution:-
a) option C. an exeriment with no control group.
b) option A. results from students may not generalize to the older and richer customers who might buy a Mercedes.
c) option A. two factors, normal/vegetarian diet and unrestricted/restricted diet.
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