1. Using the following information related to tablet computer sales in the past 9 weeks

Period	1	2	3	4	5	6	7	8	9
Actual	44	52	50	54	55	55	60	56	62

a. Calculate the forecast for the next period using Naive, Moving average (considering 3 period) and exponential smoothing (taking alpha 0.4 and forecast of Period 1 as 44).

b. Calculate the next three period forecast using linear regression method.

c. Use forecast accuracy methods (MAD, MSE, MAPE and tracking signal) for the all the methods. Note that only for the data for which you have both Actual and Forecast are known, we can calculate the forecast accuracy. Comment on the result.