Question: The scatterplot and the model in Fig. 62 compare the maxi- mum weights (in pounds) with the mean life expectancies (in years) for 16 dog

The scatterplot and the model in Fig. 62 compare the maxi- mum weights (in pounds) with the mean life expectancies (in years) for 16 dog breeds.

a. Is the association positive, negative, or neither? What does it mean in this situation?
b. Estimate the slope of the model. What does it mean in this situation?
c. If the mean weight of a dog breed is 40 pounds greater than the mean weight of another dog breed, estimate how much less the mean life expectancy is for the heavier dog breed than for the lighter dog breed.
d. On the basis of the scatterplot, a student concludes that if a dog gains weight, the dog will not live as long. What would you tell the student?

Weight versus Mean Life 16+- 14 12 10 50 100 50 200 Maximum weight (pounds)

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