Concept explainers
Speed How does the speed at which you drive affect your fuel economy? To find out, researchers drove a compact car for 200 miles at speeds
- a) Interpret the slope of this line in context.
- b) Explain why it’s silly to attach any meaning to the y-intercept.
- c) When this model predicts high Fuel Efficiency, what can you say about those predictions?
- d) What Fuel Efficiency does the model predict when the car is driven at 50 mph?
- e) What was the actual Fuel Efficiency when the car was driven at 45 mph?
- f) Do you think there appears to be a strong association between Speed and Fuel Efficiency? Explain.
- g) Do you think this is the appropriate model for that association? Explain.
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