Can somebody please help me with the questions below. I need step-by-step instructions as to how to do the moving averages using the data analysis tool in Excel.

Q1												10 Marks		Sales
														Month	Sales
a) Develop the 2-months and 3-months moving averages for the supermarket sales.						1	125
Note: use data analysis tool pack.								5 Marks			2	141
														3	125
b) Which moving average appears to provide more accurate forecasts based on MAD? Explain.					4	123
Note: show your MAD calculations.								5 Marks			5	126
														6	145
														7	147
														8	162
														9	155
														10	158
														11	147
														12	159