It is a sample from the sampling distribution of the sample mean. So it's literally, what is the probability of finding a sample within two standard deviations of the mean? That's one standard deviation. That's another standard deviation right over there. And in general, if you haven't committed this to memory already, it's not a bad thing to commit to memory, is that if you have a normal distribution, the probability of taking a sample within two standard deviations is 95, and if you want to get a little bit more accurate, it's 95.4%. But you could say it's roughly 95%. And really that's all that matters because we have this little funny language here called reasonably confident, and we have to estimate the standard deviation anyway.