34.6 Looking at Two Variables Together: Correlation and Regression
Point 3 of 7
34.6.3 The Correlation Coefficient r
Core idea
Use a single number from −1 to 1 to measure how strong the linear relationship is, and the closer to either end the more it looks like a straight line
Module goal. Move from a single variable to paired data, describe correlation, fit a line, use it to predict, and understand that correlation is not causation
eastmath.com · 34.6 Looking at Two Variables Together: Correlation and Regression · 34.6.3 The Correlation Coefficient r