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In a random sample of large cities around the world, the ozone level (in parts per million) and the population (in millions) were measured. Fitting the simple linear regression model gave the estimated regression equation .
a) How would you interpret b = 16.6?
b) Substituting x = 3 gives = 58.69. Give two different interpretations of this number.
c) Do you think this equation should be used for predicting ozone in small towns in Iowa? Explain your response in a few sentences.
d) The value of r2 is not presented here, but explain how you would interpret r2 in the context of this problem.
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