T-test

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  • T-test
    • Types of t-tests
      • Within-subjects
        • Used when all participants are tested in both conditions
      • Between-subjects
        • Used when participants are tested in only one of the two conditions
    • homogeneity of Variance
      • The distributions need to have similar variances 
      • Homogeneity = same
      • Heterogeneity of variance is a violation of this assumption
    • Levene’s test
      • Between-subjects t-test only
    • Levene’s test
      • Between-subjects t-test only
      • IF Levene’s is non-significant THEN read the top row on SPSS 
      • IF Levene’s is significant THEN read the bottom row on SPSS
    • t statistic is a ratio that tells us about our sources of variance

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