RAP Computers assembles computers from generic parts it purchases at discount and sells the units via phone

Question:

RAP Computers assembles computers from generic parts it purchases at discount and sells the units via phone orders it receives from customers responding to their ads in trade journals. The business has developed an exponential smoothing forecast model to forecast future computer demand. Actual demand for their computers for the past eight months is as follows:

a. Using the measure of forecast accuracy of your choice, ascertain if the forecast appears to be accurate.
b. Determine if a three-month moving average would provide a better forecast.
c. Use a tracking signal to monitor the forecast in part (a) forbias.