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Source Sum of Squares d. f. Variance F Between-groups 475.3 3 158.433 31.769 Within-groups 204.5 41 4.987 Total 679.8 44 Step 5) Make a decision about your null hypothesis and interpret this decision. Our F (31.764) is greater than the f critical value (4.30) and therefore we reject the null hypothesis. The means are not all equal for get tough states, moral appeal state and control states. 2. If you rejected the null hypothesis for Step 5, perform a Tukey HSD test (alpha = .05, with k = 3 groups, 40 within-groups degrees of freedom (d.f.), and 15 cases in each group) to determine which pair(s) of population means is significantly different. Make sure to show your work and list all pairs of mean differences whether they show significant differences or not. 3. Calculate the value of eta squared ( 2); and specify the strength of the relationship (weak, moderate, or strong) between the method of dealing with drunk drivers and the rate of drunk driving