How do I assess the assumptions of an independent sample t-test or ANOVA?

There are three main assumptions in these statistical techniques. The first, and most important, is independent of observations. That is, one participant does not influence the score of another participant. The second assumption is homogeneity of variance. ANOVA assumption can be tested by checking the SPSS box for “homogeneity tests.” For t-test, SPSS provides the Levene test as a default. The third assumption is normality assumption. This can be tested with a one-sample KS test. For more information you can email us at www.StatisticsSolutions.com or call 877-437-8622.