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. In general, studying for one extra hour was associated with a 15-point improvement in test score. That feels about right. In general, studying for 15 extra hours was associated with a one-point improvement in test score.