The table named "Sales" to the right, shows the sales of a supermarket (in thousand dollars) in the last 12 months. Note: to facilitate answering the questions in the next two sheets, use Exoel Data Analysis Tool Pack (except for questions 1b and 2d). 10 Marks Q1 N 3 a) Develop the 2-months and 3-months moving averages for the supermarket sales. 5 Marks 4 Note: use data analysis tool pack. 5 6 b) Which moving average appears to provide more accurate forecasts based on MAD? Explain. 5 Marks 7 Note: show your MAD calculations. 8 9 10 11 12 13 14 15 16 17 18 19 20