Question: After graduating from college, you and your friends start selling birdhouses made from recycled plastic. The idea has caught on, as shown by the following sales figures:

a. Prepare forecasts for June through September using a three-period moving average model.

b. Prepare forecasts for June through September using an exponential smoothing model with alpha = 0.5. Assume the forecast for May was 2000.

c. Prepare forecasts for June through September using an adjusted exponential smoothing model with alpha = 0.5 and B = 0.3. Assume the unadjusted forecast (F_t) for May was 2000 and the trend factor (T_t) for May was 700.