And in future videos, we'll think about how we can actually test hypotheses using some of the tools that we're thinking about right now, is that the sum of squares within plus the sum of squares between is equal to the total sum of squares. So a way to think about it is that the total variation in this data right here can be described as the sum of the variation within each of these groups, when you take that total, plus the sum of the variation between the groups. And even the degrees of freedom work out. The sum of squares between had 2 degrees of freedom. The sum of squares within each of the groups had 6 degrees of freedom. 2 plus 6 is 8. That's the total degrees of freedom we had for all of the data combined.