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.Suppose the 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.

Question

Quizplus · Accepted Answer

The slope represents the amount of electricity used per unit increase in size. In this case, size is measured in square feet, and electricity is measured in kilowatt-hours. Therefore, the units of the slope are kilowatt-hours per square foot.

A Random Sample of Records of Electricity Usage of Homes