147-sample1 - Answer Key Answers to selected questions...

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Answer Key Answers to selected questions appear with the question 1. In a randomized controlled experiment, a. the control group always gets a placebo. b. the subjects randomly assign themselves to the treatment and control groups. c. the treatment group is similar to the control group, apart from the treatment. d. (a), (b) and (c) are all true. e. none of the above are true. Answer (c) 2. In an observational study, a. the control group always gets a placebo. b. the experimenter randomly assigns the subjects to the treatment and control groups. c. the treatment group is similar to the control group, apart from the treatment. d. an association between two things can be established. e. none of the above are true. Answer (d) 3. In a double blind experiment, a. a placebo is not necessary. b. neither the subjects nor the people who evaluate the responses actually know who got the treatment. c. only the people who evaluate the responses know who got the treatment. d. both (a) and (b) are true. e. both (a) and (c) are true. Answer (b) 4. Confounding with unrelated factors can be a serious problem in a. controlled experiments. b. randomized controlled experiments. c. observational studies. d. both (a) and (c). e. both (b) and (c). Answer (d) 5. Which of the following is a qualitative measurement? a. GPA (grade point average). b. Hair color.
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c. Weekly income. d. Both (a) and (c) are qualitative measurements. e. None of the above are qualitative measurements. Answer (b) 6. In a series of repeated measurements, bias a. changes from measurement to measurement, sometimes up and sometimes down. b.
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This note was uploaded on 05/27/2008 for the course MATH 147 taught by Professor Klimko during the Fall '07 term at Binghamton.

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147-sample1 - Answer Key Answers to selected questions...

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