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.Do you think the slope is positive or negative? Why?
A)Negative.Larger homes should use less electricity.
B)Positive.The larger the number of houses the more electricity used.
C)Negative.Smaller homes should use less electricity.
D)Positive.More square feet indicates more houses.
E)Positive.Larger homes should use more electricity.

Question

Quizplus · Accepted Answer

It is reasonable to expect that larger homes require more electricity since they have more room to heat, cool, and light. Therefore, the slope of the regression line predicting electricity usage from size should be positive.

A Random Sample of Records of Electricity Usage of Homes