Problem 1: If the forecast errors for four consecutive periods are 3,5,7, and 5 , what are: a) the mean absolute deviation? b) the mean squared error? Problem 2: If the forecast errors for five consecutive periods are 8,5,7,9, and 4 , what are: a) the mean absolute deviation? b) the mean squared error? Problem 3: Using the data below: a) Find the forecast for period 6 using the nave method. b) Find the forecast for period 7 based on a two-period moving average. c) Find the forecast for period 7 based on a four-period moving average. d) Find the forecast for period 7 based on a four-period weighted moving average using the following weights: e) Find the forecast for period 7 based on exponential smoothing with alpha =0.7 and assuming that the forecast for period 4 was 600