Please include steps with your resolution to this question:

Use the monthly sales data over the past 4 years on outdoor swimming pools given below DATA 1999 2000 2001 2002 Jan 12 8 6 14 Feb 8 12 12 20 Mar 24 2 44 18 Apr 90 120 78 72 May 74 110 84 78 Jun 46 66 62 76 Jul 24 28 48 40 Aug 14 16 48 14 Sep 8 26 24 50 Oct 6 14 20 20 Nov 6 14 12 16 Dec 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