Statistics
Free statistics guides
Worked examples and practice problems with answers. Each guide ends with a few questions you can check yourself.
Guides
- Which statistical test should I use?: A plain chart for choosing a statistical test: t-tests, ANOVA, chi-square, proportion z-tests and regression, with practice scenarios and answers.
- Confidence interval practice problems: How to build and interpret a confidence interval for a mean or proportion, with a worked example and practice problems with answers.
- Hypothesis testing practice problems: Worked examples, practice questions, and answers.
- Z score practice problems: Worked examples, practice questions, and answers.
- Type I vs Type II error practice: Worked examples, practice questions, and answers.
- Two-sample t test practice: Worked examples, practice questions, and answers.