6. A study was conducted to investigate the effect of vehicle weight on gas mileage. The following random sample was collected where x is the weight of a vehicle in pounds and y is the miles per gallon. a. b. x (pounds) y (mpg) C. 2600 22.0 Refer to your EXCEL homework file. Write a sentence interpreting the value of the slope of the regression line. If a vehicle weighs 4000 pounds, what does the least-squares line predict for the miles per gallon? (Show your calculations.) Is this interpolation or extrapolation? Explain. d. 3500 16.1 2900 3900 18.8 15.7 2000 23.4 What does the correlation coefficient tell us about the relationship between weight and gas mileage? Give a brief explanation of the meaning of the coefficient of determination in the context of this problem.

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