But so there's some critical value here. The hardest thing in statistics is getting the wording right. There's some critical value here that the probability of getting a sample from this distribution above that value is only 5%. So we just need to figure out what this critical value is. And if our value is larger than that critical value, then we can reject the null hypothesis, because that means the probability of getting this is less than 5%. We could reject the null hypothesis and go with the alternative hypothesis. And to figure out that critical value, and remember, once again, we can use z-scores, and we can assume this is a normal distribution, because our sample size is large for either of those samples.