So you can ignore the question right here. You can ignore all of this. I'm just using that same data to come up with a 95% confidence interval for the actual mean emission for this new engine design. So we want to find a 95% confidence interval. And as you can imagine, because we only have 10 samples right here, we're going to want to use a t distribution. And right down here, I have a t table. And we want a 95% confidence interval.