And to figure what these critical t values are at this end and this end, we can just use a t table. And we're going to use the two-sided version of this because we're symmetric around the center. So you look at the two-sided. We want a 95% confidence interval. So we're going to look right over here, 95% confidence interval. We have 10 data points, which means we have 9 degrees of freedom. So 9 degrees of freedom for our 10 data points.