Machine derived contents note: 1. Least Squares -- 2. Means and Variances -- 3. Regression, Correlation and Determination -- 4. Additivity and Linearity -- 5. Transformations -- 6. Significance Tests -- 7. Some Underlying Theory -- 8. Experiments and Samples -- 9. Distributions, Indices of Diversity and Information -- 10. Quantitative Genetics -- 11. Population Biology -- 12. A Warning -- 13. Curve-Fitting -- 14. Outline of Methods