And the whole point of that video is to show you that, hey, it's not the difference of the variances. It's the sum of the variances. So the variance of this new distribution, and I haven't drawn the distribution yet, the variance of this new distribution, I'll just write x bar minus y bar, is going to be equal to the sum of the variances of each of these distributions. The variance of x bar plus the variance of y bar. Now, actually, let me just draw this here, just so we can visualize another distribution. Although, all I'm going to draw is another normal distribution. So this is its mean.