a. What is a residual?
b. In what sense is the regression line the straight line that "best" fits the points in a scatterplot?
a. What is a residual?
A. A residual is a value of y - Ĺ·, which is the difference between an observed value of y and a predicted value of y.
B. A residual is the amount that one variable changes when the other variable changes by exactly one unit.
C. A residual is a value that is determined exactly, without any error.
D. A residual is a point that has a strong effect on the regression equation.