9. Explain what within-groups variability is. 10. Explain why you want to maximize between groups variability but minimize your within- groups variability. 11. A researcher rejects the null hypothesis...

Extracted text: 9. Explain what within-groups variability is. 10. Explain why you want to maximize between groups variability but minimize your within- groups variability. 11. A researcher rejects the null hypothesis for a one-way between-subjects ANOVA, where k = 4. What is the next step in the analysis? Explain. 12. What is a post hoc test? Explain when to use a post hoc test? What is the difference between a Tukey post hoc and Scheffé post hoc?