The data in file XR17063 include the “apparent temperature,” how warm it “feels” at different combinations of room temperature (degrees Fahrenheit), and relative humidity (%). For y = apparent temperature, x₁ = actual room temperature, and x₂ = relative humidity, fit a first-order polynomial model to the data and interpret the partial regression coefficients and the R² value. Add an interaction term to the model. To what extent has the addition of the interaction term improved the explanatory power of the model?