Pearson Product Moment Correlational COEFFICIENT for Linear Correlation (7-2)

The Pearson Product Moment Correlational Coefficient for Linear Correlation measures how closely the data fit the model of a straight line on a scatterplot diagram. It was invented by Sir Frances Galton and the formula perfected by Karl Pearson. The Correlation Coefficient is denoted as r, which stands for “regression”. It is a two-digit number that varies between –1.00 and +1.00. The sign (positive or negative) indicates direction of linear relationship. The absolute value indicates strength of relationship.