practice-exam-28-november-2011-questions-quiz-2-version-a.doc

His observation has little value in assessing the

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His observation has little value in assessing the effects of vitamin C because A. there was no control group for comparison. B. he has not calculated a correlation coefficient. C. of the effect of the observer on the observed. D. he does not specify his dosage of vitamin C. 15. To investigate the effects of a particular study method on student performance, two different methods are tried, each with a different group of subjects. If only the experimenter knows which method is under investigation, the procedure being used is described as A. double-blind B. single-blind C. self-fulfilling prophesy D. representative sampling 4 Distributing prohibited | Downloaded by Poo Pee ([email protected])
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lOMoARcPSD|1366769 Use the information below to answer the next 3 questions . A researcher decides to investigate the relationship between public speaking experience and self-confidence. She obtains subjects from a pool of volunteers and randomly assigns them to one of two conditions. In the first condition, subjects receive a one-week public speaking course consisting of two hours each day practicing various types of speeches, receiving critiques, and evaluating each other's work. In the second condition, subjects do not attend this class. All subjects fill out a questionnaire at the end of the week. The questionnaire includes three items measured on a 7-point Likert-type scale which asks subjects about their confidence in their own abilities to meet challenges, overcome obstacles, and solve problems which they may encounter. These items are then added together to create a "self-confidence scale". 16. What kind of design has the researcher used? A. pre-test/post-test control group design B. post-test only control group design C. quasi-equivalent control group design D. static group comparison design E. Solomon four-group design 17. Which of the following is the treatment group? A. The group that received the public speaking class B. The group that didn't get the public speaking class C. The group that scored high on the self-confidence scale D. The group that scored low on the self-confidence scale E. None of the above 18. The fact that the subjects were volunteers can be used to support which of the following statements? A. The experiment has external validity (or generalizability) flaws B. The experiment has internal validity flaws C. The experiment is not replicable D. The experiment does not have equivalent control and treatment groups E. None of the above 19. Assume that it is a fact that heart disease occurs twice as frequently among males as females. Given a sample of 120 subjects selected by stratified random sampling, how many females would you expect in the sample? A. 5 C. 20 E. 40 G. 100 B. 10 D. 30 F. 80 5 Distributing prohibited | Downloaded by Poo Pee ([email protected])
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lOMoARcPSD|1366769 20. If a well-designed study demonstrates a convincing advantage of one type of treatment over another, but is based on a sample of 5 people in each group, then the study is likely to have: A. High internal and low external validity B. High external and low internal validity C. Low internal and low external validity D. High external and high internal validity 21. When a researcher promises to provide anonymity , it means A. The researchers knows the identity of the participants but does not make
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  • Winter '11
  • mervmosher
  • researcher

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