Sales Advertising Price # of stores
41 20 40 1
42 40 60 3
59 40 20 4
60 50 80 5
81 50 10 6
80 60 40 6
100 70 20 7
82 70 60 8
101 80 30 9
110 90 40 10
41 20 40 1
42 40 60 3
59 40 20 4
60 50 80 5
81 50 10 6
80 60 40 6
100 70 20 7
82 70 60 8
101 80 30 9
110 90 40 10
Hills Lighting believes that several factors influences light fixture sales. Sales are in thousands, advertising are in hundreds of dollars, and price is the unit retail price.
• Estimate a simple linear regression that only involves sales and advertising. Interpret the slope coefficient as well as R square. Show all work.
• Estimate a multiple linear regression using all the data. Interpret the slope coefficient, R square, and the adjusted R square. Show all work.
