The Cat Creek Mining Company mines and ships coal. It has experienced the following demand for coal during the past 8 years:

Year Coal Sales (tons)

1 4,260 2 4,510 3 4,050 4 3,720 5 3,900 6 3,470 7 2,890 8 3,100 Develop an adjusted exponential smoothing model (a = .30, b = .20) and a linear trend line model and compare the forecast accuracy of the two by using MAD. Indicate which forecast seems to be more accurate. LO.1