Because this isn't saying that it's guaranteed that if you study an hour extra that you'll get 15% more on the test. This is just saying that this is the general trend that this line is seeing. So it's not guaranteed. For example, we could find this student here who studied exactly two hours, and if we look at the students who studied for three hours, well, there's no one exactly at three hours, but some of them, so this was, let's see, the student who was at two hours, you go to three hours, there's no one exactly there, but there's gonna be students who got better than what would be expected and students who might get a little bit worse. Notice, there's points above the trend line and there's points below the trend line. So this exactly, you can't say it's guaranteed an hour more turns into 15%. Let's try this choice.