Using the table below creating a 3-year and 4-year moving average and predict sales for 2008. Find the mean absolute deviation (MAD) for both the 3 and 4 year moving averages.(

MAD = Error

n

Year	Sales	3-Year Moving Average	Absolute Error 3-year Moving Average	4-Year Moving Average	Absolute Error 4-Year Moving Average
2001	2030
2002	2155
2003	2382
2004	2412
2005	2606
2006	2892
2007	3018
2008

MAD 3-Year Moving Average ________________________

MAD 4-Year Moving Average _________________________