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Psychology: Evidence-Based Approach
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Testing the 'sameness'. Parametric tests assume that sampels are obtained from populations of equal variances. This means that the variability of scores for each of the groups need to be similar to each other to be comparable. SPSS performs Levene's test for equality of variances as part of the explore, t-test, and analysis of variance analyses.
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What is homogeneity of variance?
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