21.4. Chapter 4, "Formula Editor Adventures"21.5. Chapter 7, "Univariate Distributions: One Variable, One Sample"21.6. Chapter 8, "The Difference between Two Means"21.7. Chapter 9, "Comparing Many Means: One-Way Analysis of Variance"21.8. Chapter 10, "Fitting Curves through Points: Regression"21.9. Chapter 11, "Categorical Distributions"21.10. Chapter 12, "Categorical Models"21.11. Chapter 13, "Multiple Regression"21.12. Chapter 14, "Fitting Linear Models"21.13. Chapter 15, "Bivariate and Multivariate Relationships"21.14. Chapter 17, "Exploratory Modeling"21.15. Chapter 18, "Discriminant and Cluster Analysis"21.16. Chapter 20, "Time Series"