Using the umbrella sales data above, calculate forecasts using the three-period weighted moving average with weights of

Question:

Using the umbrella sales data above, calculate forecasts using the three-period weighted moving average with weights of (0.5, 0.3, 0.2) and using exponential smoothing with an α = 0.3 and a period 1 forecast of 1420. Compare the MAD’s of these two methods, and decide which one is the better forecast.