If Katie is conducting a multi-way ANOVA and dfRows 2, dfcolumns 3, dfinteraction=6, dfwithin = 85, and alpha is set at .05, what is the critical value of F for the row main effect? O2.712 O 3.104 O3.841 - O2.207 If the effects of a row explanatory variable with three levels are found to be significant in a two-way ANOVA, then: all group means differ and a post-hoc test is unnecessary. O only a pair of row means differs and there is no need for a post-hoc test. O the column explanatory variable will have no effect. a post-hoc test must be conducted to determine significant differences. Why is using a single ANOVA preferable to running a series of t tests? You must answer in your own words and may not copy and paste the text from the book. independent