Lecture video for “Data Sense: An Introduction to Statistics for the Behavioral Sciences” by Barton Poulson. This video covers Chapter 10: The Analysis of Variance (ANOVA), Section 03: Analyzing Variance. It explains how the total variance in the data is analyzed, or split up, into the differences between group means, called “Mean Square between” and the differences within the groups, called “Mean Square within.” The book and complete set of videos may be purchased at http://kendallhunt.com/poulson/.