So average computer time, actually let me write it this way, instead of average computer time, it should just be computer time. Computer time versus blood pressure. So what you do is you apply a survey to all 1,000 people, and you ask them how much time you spend on a computer, and what is your blood pressure? Or maybe you measure it in some way. And then you plot it all, you look at the data, and you see if those two variables move together. So what does that mean? Well, let me draw.