So we need to find a critical z value right over here. Let me call that a critical z. We could even say a critical z score or critical z value, so that the probability of getting a z value higher than that is 5%. So that this whole area right here is 5%. And that's because that's what our significance level is. Anything that has a lower than 5% chance of occurring, for us, will be validation to reject our null hypothesis. Or another way of thinking about it, if that area is 5%, this whole area right over here is 95%.