20 1 point A study with an N = 200 has 199 degrees of freedom for its statistic. Which of the following may be the statistical test used? O 3x 3 Factorial ANOVA Paired samples t-test Can't determine from the information given OO Independent samples t-test 21 1 point In a Factorial ANOVA, the _ is the difference in Means that is not explained by the main effects of the factors O Within-groups mean of squares Marginal mean Interaction Within-groups sum of squares 22 1 point Which of the following should you NOT do when you have a significant interaction effect? O Interpret the main effects O Run post-hoc tests Run Tukey HSD tests OO Showing the results using a bar plot 23 1 point The post-hoc test is used to _ O Test the statistical significance of the main effect Determine whether ANOVA should be performed Test the statistical significance of pairs of means Determine the standard error 24 1 point You are running an experiment to see how effective a certain educational program is. In order to do so, you compare each students' scores before and after participating in the program. Given this study, what test would you run? One-way ANOVA One sample z-test O Paired samples t-test O None of the above