16. More residuals Suppose you have fit a linear model to some data and now take a look at the residuals. For each of the following possible residuals plots, tell whether you would try a re-expression and, if so, why. a. A residual plot displays a pattern in which the cluster of points are moderately scattered and follows a concave up curve. b. A residual plot displays a pattern of points which are distributed in the vicinity of vertical axis for some length of horizontal axis and then move in a horizontal stream. c. A residual plot displays a pattern of equally and densely populated points in the first quadrant.