A Random Sample of Records of Electricity Usage of Homes

Multiple Choice

A random sample of records of electricity usage of homes gives the amount of electricity used in July 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.What units does the slope have?

A) Slope is kilowatt-hours per square foot.
B) Slope is kilowatt-hours per house.
C) Slope is square feet per kilowatt-hour.
D) Slope is square feet per house.
E) Slope is houses per kilowatt-hour.