Lecture video for “Data Sense: An Introduction to Statistics for the Behavioral Sciences” by Barton Poulson. This video covers Chapter 12: Chi-Squared, Section 01: Introduction. It explains how the chi-squared tests are a family of non-parametric tests that can be used for nominal outcome variables without making assumptions about population parameters. The book and complete set of videos may be purchased at http://kendallhunt.com/poulson/.