Question: Consider the following data on demand for a product over the period Jan 2012 to March 2013: 2011 Jan 20 Feb 25 Mar 21

Consider the following data on demand for a product over the period Jan 2012 to March 2013: 2011 Jan 20 Feb 25 Mar 21 Apr 22 May 27 Jun 28 Jul 27 Aug 30 Sep 34 Oct 25 2013 Jan 36 Feb 41 Mar 39 Nov 30 Dec 29 It is now Mar 31, 2013. Forecast demand for the next 3 months by means of an exponential smoothing model. Use some approximate procedure to get initial estimates of the mean and the linear trend, and use values of a = 0.25, =0.1 for the smoothing constants.
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