A real estate agency is interested in determining the number of houses that will be sold in a given quarter. The management of the agency believes that a relationship can be found between the number of houses sold (Y), the listed price and the current interest rates. Their past experience shows that they tend to have better luck using a non-linear model. Below is the output from a regression analysis using the natural logarithm of the explanatory variables (but not of the dependent variable) in the model.