The following scatter diagram shows the age in years (x) and the retail value (y) in thousands of dollars of a random sample of ten automobiles of the same make and model. What does the scatter diagram indicate about the relationship between the two variables? If r=-0.82, compute the R^2. What does R^2 mean? Regarding to the graph below, if the slope of the estimated regression equation is -2, write down the equation for the estimated regression line