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Psychology
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The Psychologist
Quiz 10: Designing, Conducting, Analyzing, and Interpreting Experiments With Two Groups
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Question 121
Essay
Describe the kind of data needed to conduct a correlated samples t test.
Question 122
Short Answer
Why does using a correlated-groups design reduce error variability?
Question 123
Short Answer
Describe the kind of data needed to conduct an independent samples t test.
Question 124
Short Answer
Explain this sentence: "Generally speaking, t tests are robust with regard to the assumption of homogeneity" (Smith & Davis, 2010, p. 222).
Question 125
Essay
Suppose you conducted an experiment with 20 participants in each group. What are the degrees of freedom in an independent-groups design? What are the degrees of freedom in a correlated-groups design?
Question 126
Short Answer
For a correlated-groups t test, why do you want the paired scores to be positively correlated?
Question 127
Essay
Describe two circumstances under which you would prefer an independent-groups design over a correlated-groups design.
Question 128
Essay
Distinguish between homogeneity of variance and heterogeneity of variance. Do researchers want their data to exhibit homogeneity of variance or heterogeneity of variance? Explain.