A real estate agent is interested in the relationship between the size of a home (measured in square feet) and the selling price of the home. She collects a simple random sample of nine homes in her area and records the size and price of each house. She finds a linear model to give the relationship between the size of the home (measured in thousands of square feet) and the selling price of the home (measured in thousands of dollars). The equation of the line is ŷ = 5102 + 112x, where ŷ is the selling price of the home and x is the square footage. The residual plot is shown.