Question 3 a) Distinguish between an associative model and a time-series model [2 marks] b) Discuss the four (4) qualitative forecasting methods. [8 marks] c) The last seven weeks of demand at a new car dealer are shown below. Use a three- period weighted-moving average forecast to determine a forecast for the 8th week using weights of 3, 2, and 1 (where the most recent week receives the highest weight). (Round all forecasts to the nearest whole unit.) Calculate the MAD for this forecast (covering all weeks in which error comparisons can be made). What does the MAD indicate? Sales 25 Week 1 2 3 4 5 30 27 31 27 29 7 30 [10 marks]