And what Sheera did is try to draw a line that tries to fit this data. It seems like it does a pretty good job of at least showing the trend in the data. Now, slope of 15 means that if I'm on the line, so let's say I'm here, and if I increase in the horizontal direction by one, so there I increased by the horizontal direction by one, I should be increasing in the vertical direction by 15. And you see that. We increased by one hour here, we increased by 15% on the test. Now, what that means is that the trend it shows is that in general along this trend, if someone studies an extra hour, then if we're going with that trend, then hey, you know, it seems reasonable that they might expect to see a 15% gain on their test. Now let's see which of these are consistent.