Way number eight of looking at the correlation coefficient

This post has an accompanying Jupyter Notebook! Back in August, I wrote about how, while taking the Data 8X series of online courses1, I had learned about standard units and about how the correlation coefficient of two (one-dimensional) data sets can be thought of as either the slope of the linear regression line through a two-dimensional scatter plot of the two data sets when in standard units, or the average cross product of the two data sets when in standard units. In fact, there are lots m...

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