Given the series of demand data below
Period: 1 2 3 4 5 6 7 8 9 10
Demand: 25 57 39 59 41 28 49 25 39 53
a. Calculate the forecasts for periods 7 through 11 using moving average models with n = 2, n = 4, and n = 6
b. Calculate the bias and MAD for each set of forecasts