quiz4fall07 - state each answer in the space provided and...

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POLS 203 QUIZ 4 1. For each of the following studies, the samples were given an experimental procedure and the researchers compared their results with the general population. For each sample, using the p< .01 significance level, indicate how the researchers should conclude Group Population mean Population standard deviation Sample size Sample mean Prediction A 10 2 50 12 High predicted B 10 2 100 12 High predicted C 12 4 50 12 High or low predicted D 14 4 100 12 High or low predicted Group A: Group B: Group C: Group D: 2. In an experiment, the following are the results obtained for the control and experimental groups. Is the researcher justified that the variable being tested is effective (use the .05 level)? In your answer show all steps: Pair Control group Experimental group A 72 75 B 61 60 C 48 40 D 55 65 E 81 75 F 50 60 G 42 42 H 77 70 I 60 57 J 69 78
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3. The following questions review the basic principles of inferential statistics. Please
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Unformatted text preview: state each answer in the space provided and in your own words: a. Hypothesis testing can be conducted only with a random sample. Why? b. Explain the role of sampling distribution in a test of hypothesis. c. What is a null hypothesis? Why do we test it instead of our actual research hypothesis? d. What is the critical region? How is the size of the critical region determined? e. Give an example of a research situation where a one-tailed test of hypothesis would be appropriate. f. What exactly can be concluded in the one sample case when the test statistic falls in the critical region? What can be concluded in the two-sample case, when it falls in the critical region?...
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quiz4fall07 - state each answer in the space provided and...

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