So it's going to be our sum of squares between, divided by our degrees of freedom between, and sometimes this is called the mean squares between MSB, either way, it's going to be that, divided by the sum of squares within. So that's what I had done up here. The sum of squares within in blue, divided by the sum of squares within, divided by the degrees of freedom of the sum of squares within. And that was M times N minus 1. Now let's just think about what this is doing right here. If this number, if the numerator is much larger than the denominator, then what that tells us is that the variation in this data is due mostly to the differences between the actual means, and is due less to the actual variation within the means. That's if this numerator is much bigger than this denominator over here.