Our best estimate of that, and that's why we call it confident, we're confident that the real population proportion is going to be in this interval. We're confident, but we're not 100% sure because we're going to estimate this over here. If we're estimating this, we're really estimating that over there. If this can be estimated, it's going to be estimated by this sample standard deviation. Then we can say this is going to be approximately, or if we didn't get a weird, completely skewed sample, it actually might not even be approximately if we just had a really strange sample. Maybe we should write confident that. Confident that the standard deviation of our sampling distribution is going to be around, instead of using this, we can use our standard deviation of our sample, our sample standard deviation.