Please include steps with your resolution to this question:

1. Use the monthly sales data over the past 4 years on outdoor swimming pools given below DATA 1999 2000 2001 Jan 2002 12 8 Feb 6 14 8 12 12 Mar 20 24 2 44 Apr 18 90 120 78 May 74 72 110 84 Jun 78 46 66 62 Jul 76 24 28 48 Aug 40 14 16 48 Sep 14 8 26 24 Oct 50 6 14 20 Nov 20 6 14 12 Dec 16 16 12 18 8 a. What are the seasonal indices for each month? b. What's the "best" forecasting method on the deseasonalized data? Provide a summary table of the different forecast methods you looked at (try at least 3 methods, in addition to any naive ones you may include), along with whatever error measure you calculated for the methods (i.e., MAD, MAPE, or MSE) c. What's your forecast for January 2003