The scales were weird. So Karl Pearson came up with the idea of first transforming each score to a standard score. The full name for r is the Pearson Product Moment Correlation Coefficient. So product moment means multiply the deviations This is laborious to convert to z scores, so there are many other algebraiclly equivalent formulae that are easier to do. So as height increases, weight increases a little.
Correlation is low because there are some short fat people and some tall skinny people.
Of course not. We will talk more about correlation tomorrow. Click here to return to the top of the page.