So we have some data here that we can plot on a scatter plot that looks something like that. And so the next question, given that we've been talking a lot about lines of regression or regression lines, is can we fit a regression line to this? Well, if we try to, we might get something that looks like this, or maybe something that looks like this. I'm just eyeballing it. Obviously, we could input it into a computer to try to develop a linear regression model to try to minimize the sum of the squared distances from the points to the line. But you can see it's pretty difficult. And some of you might be saying, well, this looks more like some type of an exponential.