Advertising expenditure and sales figures for a company during the previous 15 weeks were recorded below:

Week	Ads expense ($'000s)	Sales ($'000s)
1	3	50
2	5	250
3	7	700
4	6	450
5	6.5	600
6	8	1000
7	3.5	75
8	4	150
9	4.5	200
10	6.5	550
11	7	750
12	7.5	800
13	7.5	900
14	8.5	1100
15	7	600

1. Build a regression model table (Excel Analysis tool pack)
2. Interpret the R-square. Do you see a strong linear relationship between the independent and dependent variables?
3. Manually calculate SSE of your model. (Note: you can cross-check your SSE to see if you calculate it correctly).