Given the following information: Month 1 2 3 4 5 Sales 9 11 10 12 8 (iii) the mean absolute deviation is 6 7 (a) Using the three-period weighted moving average with weights assigned to the m recent in order 4, 2 and 1, (i) the sales forecast for Month 7 is (ii) the forecasting error for Month 5 is (b) Using an exponential smoothing technique with alpha = 0.5 (i) the sales forecast for Month 7 is (iii) the mean absolute deviation is (ii) the forecasting error for Month 4 is Time

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