Then we find the squared distance from that expected value, and we, I guess you could call it, normalize it by the expected value, take the sum of all of those differences. And if those differences, those squared differences, are really big, the probability of getting it would be really small, and maybe we'll reject the null hypothesis. So let's just figure out how we can get the expected number. So we're assuming the herbs do nothing. So if the herbs do nothing, then we can just figure out that this whole population, they just had nothing happen to them. These herbs were useless. And so we can use this population sample, or I shouldn't call it the population.