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 D A residual is a value that is determined exactly without any error