In a study of 30 customers' utility bills in which the monthly bill was the dependent variable and the number of square feet in the house is the independent variable, the resulting regression model is = 23.40 + 0.4x. Based on this model, the expected utility bill for a customer with a home with 2,300 square feet is approximately $92.00.

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The expected utility bill is calculated by substituting x = 2300 into the regression model equation: = 23.40 + 0.4(2300) = 23.40 + 920 = 943.40.

In a Study of 30 Customers' Utility Bills in Which