And this is what gives us our chi-squared statistic. Now let's just calculate what this number is going to be. So this is going to be equal to, I'll do it over here so we don't run out of space. Let me do this in a new color. I'll do it in the orange. This is going to be equal to, this is what? 30 minus 20 is 10 squared, which is 100 divided by 20, which is 5.