5. The strength and direction of the linear relationship between X and Y. .5_ The regression result = elevation of the line at X=U, and called the intercept. The equation of the regression line is Y = a + bX. Match the following symbols to the description to the right. 1. Denotes the variable plotted on the horizontal axis and called the explanatory or independent variable. v X 2. Denotes the variable plotted on the vertical axis and is called the v b response or dependent variable. 3. The regression result = the change Y in Y for a change in X of +1, and called the slope. v R 4. The proportion of the variability of Y that is explained by or v a accountable to X