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
Plot sales versus time.
Estimate the regression model for a linear time trend of sales.
What is the mean absolute percent error of the linear regression estimates for these 10 years?
Using this model, estimate sales for year 11.
