A real estate agency collected the data shown below, where
y = sales price of a house (in thousands of dollars)
x_{1 }= home size (in hundreds of square feet)
x_{2 }= rating (an overall rating for the house expressed on a scale from 1 (worst) to 10 (best).
Sales Price (y) Home Size (x_{1}) Rating (x2)
180.0 23 5
98.1 11 2
173.1 20 9
136.5 17 3
141.0 15 8
165.9 21 4
193.5 24 7
127.8 13 6
163.5 19 7
172.5 25 2
The agency developed the following regression model:
y = β_{o }+ β_{1 }x_{1 }+ β_{2 }x_{2}+ €
a) Show why this may be a reasonable model for the relationship between the sales price and home size?
b) What factors are represented in the error term in this model? Give a specific example of these factors.