So really, just this video, 95% confidence interval. In the next video, we'll actually do a hypothesis test using this same data. Now to do a 95% confidence interval, let's think about the distribution that we're thinking about. So let's look at the distribution. Of course, we're going to think about the distribution that we're thinking about. We want to think about the distribution of the difference of the means. So it's going to have some true mean here.