A Random Sample of Records of Electricity Usage of Homes

question 2

Multiple Choice

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
= 1,287 + 0.3 size.The people in a house that is 2,347 square feet used 500 kilowatt-hours less than expected.How much did they use?

• A)1,491.1 kilowatt-hours
• B)3,134.3 kilowatt-hours
• C)-82.9 kilowatt-hours
• D)3,533.33 kilowatt-hours
• E)1,204.1 kilowatt-hours

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Definitions:

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