Answer a few questions about your research question and your variables. The guide points you to the right analysis and, where we have one, the calculator to run it.
Three things determine the test: your goal (compare groups, measure a relationship, or describe), the type of your variables (continuous scores vs categories), and your design (different people in each group vs the same people measured repeatedly). Every branch in this guide asks about one of those.
The guide covers the analyses students meet most often. Real datasets also need assumption checks (normality, variance, outliers) before trusting a test; that is what a full statistics package is for. ReliCheck Quanta runs those checks automatically on your Mac.