QUESTION 3

The number of laptops per quarter sold by a computer outlet in a suburb was recorded, for three consecutive years from 2011 to 2013. The results are presented in the table below.

3.1. Determine the adjusted seasonal indices. 

3.2. Show that the linear regression equation is given by y = 210.3788 + 2.1853x.

Hint : Use 1, 2, 3,...for 0.1 of 2011, 02 of 2011, Q3 of 2011, .... 

3.3. Use the results of 3.1. and 3.2. above to estimate the number of laptops sold by the outlet in quarter 3 of  2014.