a. Cars are becoming more fuel efficient and, therefore, use less gas per mile. D will increase D will decrease S will increase S will decrease P will increase P will decrease P will be indeterminate Q will increase Q will decrease
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Step 1: Fuel efficiency is defined as the ratio of distance traveled to the amount of fuel consumed. Show more…
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Suppose we have a collection of cars. We measure their weights and fuel efficiencies, and generate the following graph of the data. Note: automobile fuel efficiency is often measured in mpg (miles per one gallon of gas). For this data set, X represents the weight of each car in hundreds of pounds, and Y represents the predicted fuel efficiency of each car in miles per gallon (mpg). A reasonable value for the slope of the regression line is -1.11. Which of the following statements is the most complete valid conclusion about the relationship between weight and fuel efficiency? Heavier cars tend to have lower mpg ratings. For every 100-pound increase in car weight, we expect to see a 1.11 mpg increase in fuel efficiency. For every 1-pound increase in car weight, we expect to see a 1.11 mpg decrease in fuel efficiency. For every 100-pound increase in car weight, we expect to see a 1.11 mpg decrease in fuel efficiency.
Ana Carolina D.
If a linear regression equation describes the relationship between diesel fuel efficiency (miles per gallon, Y) and weight of the vehicle (pounds, X) and the coefficient of correlation is r = -0.70 (R^2 = 0.49), which of the following would be the most appropriate conclusion to reach based on the correlation? A. As vehicle weight increases, fuel efficiency tends to decrease. B. Differences in vehicle weights account for 70% of the variation in fuel efficiency. C. Heavier vehicles have 70% lower fuel efficiency than lighter vehicles. D. There is no linear relationship between X and Y. E. The Y-Intercept of the regression equation has a negative value.
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What effect will each of the following have on the demand for small automobiles such as the Mini Cooper and Smart car? a. Small automobiles become more fashionable. b. The price of large automobiles rises (with the price of small autos remaining the same). c. Income declines and small autos are an inferior good. d. Consumers anticipate that the price of small autos will greatly come down in the near future. e. The price of gasoline substantially drops.
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