Adding a Regression Line
See one more important piece of information that'll improve how we understand our data in its R-squared value.
We already saw how our plot showed a visible trend up and to the right. But, as we also saw, there were outliers. Can we be confident that the outliers are the exceptions and that the overall relationship between our two data sources is sound? There’s only so much we can assume based on visually viewing a graph. At some point, we’ll need complex numbers ...