Problem 3: Using the data below: Period 1 2 3 Sales 543 482 501 4 5 6 513 495 525 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: 1 period prior 2 periods prior 3 periods prior 4 periods prior 0.4 0.3 0.2 0.1 e) Find the forecast for period 7 based on exponential smoothing with alpha = 0.7 and assuming that the forecast for period 4 was 500