Given the series of demand data below
Period: 1 2 3 4 5 6 7 8 9 10
Demand: 36 32 60 41 21 41 32 39 29 45
a. Calculate the forecasts for periods 7 through 11 using moving average models with n = 2, n = 4, and
n = 6. (Round your intermediate calculations and final answers to 1 decimal place.)

b-1. Calculate the bias and MAD for each set of forecasts. (Negative answers should be indicated by a minus sign. Round your intermediate calculations and final answers to 1 decimal place.)

b-2. Which moving average model is best with respect to MAD?

a. 2-week moving average
b. 4-week moving average
c. 6-week moving average