mid-term2 Answer Key

mid-term2 Answer Key - 1. Many studies are trying to find a...

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1. Many studies are trying to find a cure for chronic back pain. In one such study, a physician is comparing the medication currently being used (drug A) to a newly developed drug (drug B). Seventy-three volunteers, suffering from chronic back pain, are participating in the study. The physician’s assistant has a list of all 73 subjects and randomly divides the subjects into two groups. Group 1 will receive drug A and group 2 will receive drug B. The assistant is the only one who knows what group the subjects have been assigned. The physician monitors the subjects over a two month period and the amount of improvement is recorded. What type of study is this. a. An observational study. b. An experiment, but not a double-blind experiment. c. A double-blind experiment. d. A matched-pairs experiment. Use the following narrative to answer questions 2 - 4. Twenty people, who suffer from chronic fatigue syndrome, volunteer to take part in an experiment to see if shark fin extract will increase one’s energy level. Eight of the volunteers are men and four are women. Half of the volunteers are to be given shark fin extract twice a day. We wish to make sure that four men and two women are assigned to each of the treatments, so we decide to use a block design with the four men forming one block and the women the other. 2. For which reason is a block design appropriate in this experiment? a. Gender equality is an important legal consideration in this study. b. We believe men and women will respond differently to treatments. c. We want the conclusions to apply equally to men and women. d. All of the above. 3. Suppose one of the researchers is responsible for measuring if a subject displays an increase in energy level. What design principle should be added to this experiment? a. Two placebos. b. Use a stratified sampling design to assign the treatments. c. Use fewer subjects but observe them more frequently. d. Conduct the study as a double-blind experiment. 4. Each of the eight men receives a label: 1 through 8. Use the list of random digits below to determine the labels of the four men who are to be given the shark fin extract twice a day. 02902 28461 80624 10082 56872 88033 48932 03845 98302 83623 36704 a. 0,2,9,0. b. 02,06,08,03 c. 2,8,4,6 d. 2,2,2,4.
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Use the following to answer questions 5-7. A medicine to remove the redness in eyes was tested in a group of 100 students. Each student took either the medicine or a placebo in both eyes. The specific treatment for each student was decided by flipping a coin. The participants in the study did not know if heads or tails resulted in the medication. 5. For each of the following basic principles of statistical design indicate if it was used in the experiment or not. (True it was used, False it wasn’t) a. Control. T b. Randomization. T c. Repeated Measures. T d. Blinding. T 6. Fill in the Blank. The participants were given some free time after receiving their drops. The researcher did not keep track of what they did in that free time. It turns
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This homework help was uploaded on 04/01/2008 for the course STOR 155 taught by Professor Andrewb.nobel during the Fall '08 term at UNC.

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mid-term2 Answer Key - 1. Many studies are trying to find a...

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