One of the most common questions of prospective house buyers

One of the most common questions of prospective house buyers pertains to the average cost of heating in dollars (Y). To provide its customers with information on that matter, a large real estate firm used the following 4 variables to predict heating costs: the daily minimum outside temperature in degrees of Fahrenheit (X_1), the amount of insulation in inches (X_2), the number of windows in the house (X_3), and the age of the furnace in years (X_4).

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