1) Question 4 (4 points) Three different forecasting methods applied on the same data set resulted with the biases shown in graphs (1), (2), and (3). (1) (2) 4 16 0 13579 -4 19 11 13 15 12 17 8 -8 4 -12 0 -16 -4 13579 19 11 13 15 17 (3) 15 10 5 0 -5 -10 13579 19 -15 11 a) 13 15 17 Interpret the graph depicted in (1). b) Assuming that the sizes of the errors (say, MAD and/or MAPE) are comparable, when might method (1) be preferred to methods (2) and (3)? Explain your