PLEASE DON'T COPY AND PASTE THE PREVIOUS ANSWER. I KNOW IT'S OUTDATED, COMPLETELY WRONG, AND LACKS EXPLANATION. I'LL REPORT THOSE ACTIONS

The Willow River Mining Company mines and ships coal. It has experienced the following demand for coal during the past eight years:

Year Coal Sales (tonnes)

1 4260

2 4510

3 4050

4 3720

5 3900

6 3470

7 2890

8 3100

Develop an adjusted exponential smoothing model (=0.30, =0.20) and a linear trend line model, and compare the forecast accuracy of the two using MAD. Indicate which forecast seems to be most accurate.