So it's that one sample proportion that she was able to calculate, plus or minus z star. And we're gonna think about which z star, because that's essentially the question, the critical value. So plus or minus some critical value times, and what we do, because in order to actually calculate the true standard deviation of the sampling distribution, of the sample proportions, well, then you actually have to know the population parameter. But we don't know that, so we multiply that times the standard error of the statistic. And we've done this in previous videos. But the key question here is, what is our z star? And what we really needed to think about is, assuming that the sampling distribution is roughly normal, and this is the mean of it, which would actually be our true population parameter, which we do not know.