1. in the case of highly different sample sizes across groups the robustness of the F test to non normality and variance heterogeneity often ------ sometimes considerably so. A. Diminishes B. Increases C. Fluctuates D. None of the above 2. When a statistically significant ------ effect has only two levels the nature of the relationship is determined in the same fashion as for the independent groups t test. A. Interaction B. Simple C. Main D. Both a and b Solution 1.B Increases 2. C Main effect.