Monthly sales of a product over an eight-month period from January to August 2023 have been 195,180,301,222,309,181,79, and 230 . a) Please determine the one-step-ahead sales forecasts for months April through August using three-month moving averages. b) Please determine the one-step-ahead sales forecasts for months April through August using exponential smoothing with =0.2. Please use the same forecast for April in part (a). c) Which method is better based on MAD? d) Which method is better based on MSE? e) Is the answer in part (c) the same as the answer in part (d)? Why? f) What is the forecast made at the end of June for the sales in December 2023 using exponential smoothing