This difference of parameters is still a parameter. We don't know what the true difference of these two population parameters are, or these two population proportions, but we're going to try to come up with a 95% confidence interval for that difference. And the way we do that, we go out and we find 1,000 likely men to vote, or men likely to vote, and 1,000 women likely to vote. So let's write this down. So we get 1,000 men. When we survey the 1,000 men, let's say 642 say that they will vote for the candidate, so they are 1s. And then the remainder, we could even, what would it be, 358?