If our alternate hypothesis is correct, then these means will not all be the same. So how can we test this hypothesis? So what we're going to do, we're going to assume the null hypothesis. This is what we always do in our hypothesis testing. We're going to assume our null hypothesis, and then essentially figure out what are the chances of getting a certain statistic this extreme. And I haven't even defined what that statistic are. So we're going to define, we're going to assume our null hypothesis, and then we're going to come up with a statistic called the F statistic.