Observed weekly sales of ball peen hammers at the town hardware store over an eight-week period have been i (14,9,30, 22,34, 12,19,23): _ a) Suppose that three-week moving averages are used to forecast sales. Determine the one-step-ahead forecasts for weeks 7 and 8 b) Suppose that exponential smoothing is used with a smoothing constant of a 0.15. Find the exponential smoothing forecasts for weeks 4 through 8. [To get the method started, use the same forecast for week four as you used in part (a)] - c) What is the exponential smoothing forecast made at the end of week 6 for the sales in week 12