For a product the demand data has been shown in the table below for the year. Compare the forecasts using a forecasting method with a period of 5 months and an Exponential smoothing Method with an α of 1/3. For Exponential Smoothing use the midpoint of first 5 month range of the average as the initial Forecast. (Updated Hint: the Exponential Smoothing Forecast therefore in March 2013 for April 2013 will be 4951)
Month Demand
jan 4576
Feb 5568
Mar 3240
Apr 5978
May 5395
Jun 4644
Jul 5880
Aug 6096
Sep 5967
Oct 5828
Nov 5808
Dec 6076
From June to December which method of forecasting outperform the others?