The residual plot for a data set is shown. based on the residual plot, which statement best explains whether the regression line is a good model for the data set and why? a. the regression line is not a good model because some residuals are negative. b. the regression line is a good model because the points in the residual plot are close to the x-axis. c. the regression line is a good model because there is a pattern in the residuals. d. the regression line is not a good model because the points in the residual plot form a curve.