Section 4.2 Summary

1. Section 4.2 introduces regression, where the linear relationship between two numerical variables is approximated using a straight line, called the regression line. The equation of the regression line is written as $\hat{y}=b_{1}x+b_0$, where the regression coefficients are the $y$ intercept, $b_0$, and the slope, $b_1$.
2. The regression equation can be used to make predictions about values of $y$ for particular values of $x$.