Question

A company’s sales for the years 2010 to 2018 were as follows: ( x N$ 10 000 )

Year	2010	2011	2012	2013	2014	2015	2016	2017	2018
Sales	324	296	310	305	295	347	348	364	370

2.1) Derive, by using the method of least squares, an equation of linear trend for the sales of the company. (Use sequential numbering with x = 1 in 2010) (8)

2.2) Use the trend line equation obtained in Question 2.1 to compute trend values for the sales in the years 2008 and 2021

Answer 1