What is the difference between Pearson's correlation coefficient,r, and the coefficient of determination,r2? What does each statistic tell us about the relationship between two variables? What do these statistics NOT tell us about the relationship between two variables? What is the difference between strength and fit when interpreting regression equations? Do we always need to report and discuss both? How do you interpret b1 in simple linear regression? How do you interpret the intercept in simple linear regression?