And if you take this total error, you can figure out the probability of getting that total error if you hold some parameters, or if you assume some parameters. And we'll talk more about it in the next video. Now with that said, I just want to show you how to read a chi squared distribution table. So if I were to ask you if this is our distribution, let me pick this blue one right here. So over here we have 2 degrees of freedom, because we're adding 2 of these guys right here. If I were to ask you what is the probability of Q2 being greater than 2.41? And I'm picking that value for a reason.