Why isn't this 503? Remember, your hypothesis is going to be about the population parameter, your assumption about the population parameter. This 503 milliliters right over here, this is a sample statistic. This is a sample mean that's trying to estimate this thing right over here. When we do our significance test, we're going to incorporate this 533 milliliters. We're going to think about, well, what's the probability of getting a sample statistic, a sample mean, this far or further away from the assumed mean if we assume that the null hypothesis is true, and if that probability is below a threshold, our significance level, then we reject the null hypothesis, and it would suggest the alternative. But if we're just trying to generate or write a set of hypotheses, this would be our null hypothesis.