Exam 11: Designing, Conducting, Analyzing, and Interpreting Experiments With More Than Two Groups

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Explain why it is generally easier to reject the null hypothesis in a correlated-groups design than in an independent-groups design.

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What kind of statistical analysis would you conduct if you used multiple groups and correlated groups of participants?

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How does the multiple-group design differ from the two-group design? Describe an example of a two-group design, and then modify it to be a multiple-group design.

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What does it mean for the tails of distributions to be asymptotic? Why is this relevant when you see a probability value of .000 in your computer output?

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If you obtain an F ratio of 5, this means that the __________-groups variability is five times larger than the __________-groups variability.

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Which of the following is the FIRST question researchers should ask themselves when considering any experimental design?

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Nicholas conducts a study in which the mean square within groups is 12 and the mean square between groups is 24. What is the F ratio?

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Researchers often choose a correlated-groups design over an independent-groups design when

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In what way is a two-group design different from a multiple-group design?

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Post-hoc comparisons are conducted after a

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The tails of a distribution are asymptotic, which means that the tails

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What is the formula for within-groups degrees of freedom?

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Describe the repeated measures approach to creating multiple-correlated groups and give an example. In addition, give an example of a research study that would NOT be appropriate for repeated measures and explain why this study would not work as repeated measures.

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A(n) ___________ groups design has fewer degrees of freedom compared to a(n) ___________ groups design.

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A table that contains the results of an ANOVA is referred to as a(n) _________ table.

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Questions refer to Table 11-2. In this study, 10 children completed a survey regarding their impressions of smokers at age 8 and then again at age 10 and 12. Scores could range from 1 (extreme negative impression of smokers) to 20 (extreme positive impression of smokers). Table 11-2 GROUP MEAN STD DEV STD ERROR 1 (AGE 8) 10 9.70 5.89 1.86 2 (AGE 10) 10 10.40 5.58 1.76 3 (AGE 12) 10 11.80 5.94 1.88 ONEWAY ANOVA: SMOKING by AGE (CORR SAMP) SUM OF MEAN SOURCE SQUARES DF SQUARES F RATIO PROB. AGE 22.87 2 11.43 6.76 .006 SUBJECTS 879.63 9 97.74 34.71 .000 WITHIN CELLS 30.47 18 1.69 TOTAL 932.97 29 POST HOC TEST: Tukey-HSD with significance level .05 * Indicates significant differences shown for pairings 1 2 3 Mean 9.70 Grp 1 10.40 Grp 2 11.80 Grp 3 -Consult Table 11-1. Which of the following is written using correct APA format?

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If our IV has no effect, then the F value should be

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When the "subjects" source is significant in an ANOVA source table, it means that

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Mean squares are computed by

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What is the difference between between-groups variability and error variability? Which would you like to be larger and why?

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