1. Nelson Industries manufactures a part for a type of aircraft engine that is becoming obsolete. The sales history for the last 10 years is as follows:

   (c4p9)	Year	Sales
   	2008	945
   	2009	875
   	2010	760
   	2011	690
   	2012	545
   	2033	420
   	2014	305
   	2015	285
   	2016	250
   	2017	210

   1. Plot sales versus time.

   2. Estimate the regression model for a linear time trend of sales.

   3. What is the mean absolute percent error of the linear regression estimates for these 10 years?

   4. Using this model, estimate sales for year 11.

Please solve using forecast x or Excel so I can figure out what I am doing wrong