A random sample of records of electricity usage of homes in the month of July gives the amount of electricity used and size (in square feet)of 135 homes.A regression was done to predict the amount of electricity used (in kilowatt-hours)from size.The residuals plot indicated that a linear model is appropriate.The model is
= 1,240 + 0.5 size.How much electricity would you predict would be used in a house that is 2,372 square feet?
A)54 kilowatt-hours
B)2,264.00 kilowatt-hours
C)1,186 kilowatt-hours
D)2,426 kilowatt-hours
E)3,612.5 kilowatt-hours

Question

A random sample of records of electricity usage of homes in the month of July gives the amount of electricity used and size (in square feet)of 135 homes.A regression was done to predict the amount of electricity used (in kilowatt-hours)from size.The residuals plot indicated that a linear model is appropriate.The model is 
= 1,240 + 0.5 size.How much electricity would you predict would be used in a house that is 2,372 square feet?
A)54 kilowatt-hours 
B)2,264.00 kilowatt-hours 
C)1,186 kilowatt-hours 
D)2,426 kilowatt-hours 
E)3,612.5 kilowatt-hours

Quizplus · Accepted Answer

Using the given model 11ea7dab_38f2_14e5_b67a_ed9b244ee79d_TB3448_11_TB3448_11= 1,240 + 0.5 size, we can plug in the given size of the house (2,372 square feet):
11ea7dab_38f2_14e5_b67a_ed9b244ee79d_TB3448_11_TB3448_11= 1,240 + 0.5 (2,372) = 1,240 + 1,186 = 2,426 kilowatt-hours.

Therefore, the best choice is D, which represents the predicted amount of electricity that would be used in a house that is 2,372 square feet.

A Random Sample of Records of Electricity Usage of Homes