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? OA. A residual is a value of y-y, which is the difference between an observed value of y and a predicted value of y. OB. A residual is the amount that one variable changes when the other variable changes by exactly one unit. OC. A residual is a point that has a strong effect on the regression equation. OD. A residual is a value that is determined exactly, without any error. b. In what sense is the regression line the straight line that "best" fits the points in a scatterplot? The regression line has the property that the sum ... of the residuals is sum of squares possible sum.

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