As energy costs skyrocket, customers of Burlington Power expressed concern over their home heating bills. The staff at Burlington selects a sample of n = 50 home owners to form a data set regressing monthly invoices for February on family size, square footage of the home, and if the home was located in the city, a suburban locale, or rural county area. Partial results are shown here.

a. Fill in the missing values in all three output tables.

b. Which variables are significant at the 5% level? At the 1% level?

c. Compute the expected power bill if a family of three lived in the county in a 1,125-square-foot house.

d. What is the bill for same family living in same-size house in the suburbs?

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Intercept FamSize Footage City County Coefficients -11.77 23.61 0.2496 8.99 -5.24 Standard Error 21.11589523 11.39918888 0.104693595 4.304876277 8.506493506 t Stat p-Valne