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Welcome to «Concepts and Applications of Inferential Statistics», which is a free, full-length, and occasionally interactive statistics textbook. It is a companion site of «VassarStats: Web Site for Statistical Computation». The materials on this site may be freely used for any non-commercial educational purpose.

The best web browsers for viewing the materials on this site are Safari and Firefox, both of which are available cost-free for both Windows and Macintosh platforms. Internet Explorer is not recommended, as it provides poor support for modern web formatting standards.

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Chapter 1. Principles of Measurement Part 1 of 2
Part 2 of 2
Chapter 2. Distributions Part 1 of 3
Part 2 of 3
Part 3 of 3
Chapter 3. Introduction to Correlation & Regression Part 1 of 3
Part 2 of 3
Part 3 of 3
[Capítulo 3 en español]
Appendix 3a. Partial Correlation
Appendix 3b. Rank-Order Correlation
Chapter 4. A First Glance at the Question of Statistical Significance Part 1 of 1
Appendix 4a. Sampling Distributions of r
Appendix 4b. Test for the Significance of r
Chapter 5. Basic Concepts of Probability Part 1 of 3
Part 2 of 3
Part 3 of 3
Appendix 5. Binomial Probability Calculator
Chapter 6. Introduction to Probability Sampling Distributions Part 1 of 1
Appendix 6. Binomial Sampling Distribution Generator
Chapter 7. Tests of Statistical Significance: Three Overarching Concepts Part 1 of 1
Chapter 8 Chi-Square Procedures for the Analysis of Categorical Frequency Data. Part 1 of 3
Part 2 of 3
Part 3 of 3
Appendix 8a. The Fisher Exact Probability Test
Appendix 8b. Chi-Square Sampling Distribution Generator
Chapter 9. Introduction to Procedures Involving Sample Means Part 1 of 3
Part 2 of 3
Part 3 of 3
Sampling Distributions of t
Chapter 10. t-Procedures for Estimating the Mean of a Population Part 1 of 1
Chapter 11. t-Test for Two Independent Samples Part 1 of 1
Appendix 11. Non-Parametric Alternative: The Mann-Whitney Test
Chapter 12. t-Test for Two Correlated Samples Part 1 of 1
Appendix 12. Non-Parametric Alternative: The Wilcoxon Signed-Rank Test
Chapter 13. Conceptual Introduction to the Analysis of Variance Part 1 of 1
Appendix 13. Sampling Distributions of F
Chapter 14. One-Way Analysis of Variance for Independent Samples Part 1 of 2
Part 2 of 2
Appendix 14. Non-Parametric Alternative: The Kruskal-Wallis Test
Chapter 15. One-Way Analysis of Variance for Correlated Samples Part 1 of 3
Part 2 of 3
Part 3 of 3
Appendix 15. Non-Parametric Alternative: The Friedman Test
Chapter 16. Two-Way Analysis of Variance for Independent Samples Part 1 of 5
Part 2 of 5
Part 3 of 5
Part 4 of 5
Part 5 of 5
Chapter 17. One-Way Analysis of Covariance for Independent Samples Part 1 of 3
Part 2 of 3
Part 3 of 3
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