# Ch9 - Chapter 9 The Independent Groups and Paired Samples...

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Chapter 9: The Independent Groups and Paired Samples t-tests Monday, October 3, 2011

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Purpose of the tests: Determine if two sets of scores are likely to come from different populations. Assumptions of the tests: Samples of the two groups are independently and randomly selected from their respective populations; Scores in each underlying population are normally-distributed; Variances in the populations are roughly equal in size. Monday, October 3, 2011
Which t-test? Both require: (A) Quantitative dependent variable (DV) (B) Exactly two different conditions in the independent variable (IV) (C) Is the IV. ... between-subjects? Independent Groups t-test within-subjects? Paired samples t-test Monday, October 3, 2011

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A research investigated discriminatory attitudes toward women by administering an attitude scale to 5 men and 5 women. Scores could range from 1-10, with higher values indicating more discriminatory attitudes. Test for a relationship between gender and discriminatory attitudes using a non-directional test with alpha set at .05. Men Women 7 4 7 3 8 4 7 5 6 4 Monday, October 3, 2011
*Gender is between-subjects, so use the independent groups t-test (1) Statistical Hypotheses: H 0 : μ 1 = μ 2 H 1 : μ 1 = μ 2 Note: this is a simplifed way oF stating that: H 0 : μ 1 - μ 2 = 0 H 1 : μ 1 - μ 2 = 0 Monday, October 3, 2011

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A. alpha level = .05
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Ch9 - Chapter 9 The Independent Groups and Paired Samples...

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