That is the same thing as that. Or another way of saying it is if we think about the distribution, if we think about the mean of the distribution of the difference of the sample means, and we focused on this in the last video, that that should be equal to 0. Because this thing right over here is the same thing as that right over there. So that is our null hypothesis. And our alternative hypothesis is just going to be, our alternative hypothesis, I'll write it over here, our alternative hypothesis is just that it actually does do something, that our mean, and actually let's say that it actually has an improvement. So that would mean that we have more weight loss. So if we have the mean of group 1, the population mean of group 1 minus the population mean of group 2 should be greater than 0.