Bob is a photographer who sells his 13 * 19 prints on consignment at Island Art in Stone Harbor, New Jersey.

Each week during the summer, Bob checks the inventory so that he can replenish the prints that have been sold. The following data show the number of prints sold each week during the last eight weeks:

Week 1 2 3 4 5 6 7 8 Sold 9 12 10 6 9 15 11 7

a. Forecast the demand for Week 9 using a two-period simple moving average.

b. Calculate the MAD for the forecast in part a.

c. Forecast the demand for Week 9 using a three-period simple moving average.

d. Calculate the MAD for the forecast in part c.

e. Which forecast should you choose?

AppendixLO1