Yellow and blue make green. Let me do this one in green. So I'll call this the sampling distribution. This is the sampling distribution of this statistic, of P1 minus P2. And so it has some mean over here. It has some mean, the mean of the sample of P1 minus the sample mean, or the sample proportion of P2. And we know from things that we've done in the last several videos, that this is going to be the exact same thing as this mean minus this mean, which is the exact same thing as P1 minus P2.