Do heavier cars use more gasoline? To answer this question,a researcher randomly selected 15 cars.He collected their weight (in hundreds of pounds) and the mileage (MPG) for each car.From a scatter plot made with the data,a linear model seemed appropriate.The following output was obtained from SPSS:
Which of the following descriptions of the value of the slope is the correct description?
A) We cannot interpret the slope because we cannot have a negative weight of a car.
B) We estimate the mileage to decrease by 0.521 miles per gallon when the weight of a car increases by 1 pound.
C) We estimate the mileage to decrease by 0.521 miles per gallon when the weight of a car increases by 100 pounds.
D) We estimate the mileage to decrease by 52.1 miles per gallon when the weight of a car increases by 100 pounds.