Correlation coefficient - r Measures the strength and direction of the linear relationship between quantitative variables. Strength + r = positive correlation - r = negative correlation Direction strong moderate weak
Recipe for r There is a _(strength)___, ___(direction)____, linear relationship between __(explanatory)__ and __(response)__. Let’s use the formula to find r. This will be the only time we do it by hand. After today we will find it using on the calculator.