If it's less than 5%, we're going to reject the null hypothesis in favor of our alternative. So how do we think about that? Well, let's think about just a normalized normal distribution. Or maybe you could call it a z distribution if you want. If you look at a normal distribution, a completely normalized normal distribution, its mean is at 0. And essentially, each of these values are essentially z scores, because if you're a value of 1, it literally means you're one standard deviation away from this mean over here. So we need to find a critical z value right over here.