Question: The table for Exercise 3.9 gave the average August temperature (y) and geographic latitude (x) for 20 cities in the United States. (The data are

◆ The table for Exercise 3.9 gave the average August temperature (y) and geographic latitude (x) for 20 cities in the United States. (The data are part of the temperature dataset on the companion website.) Exercise 3.18 gave the information that the regression equation relating these two variables is y^ 5 113.6 2 1.01x

a. The latitude at the equator is 0. Using the regression equation, estimate the average August temperature at the equator.

b. Explain why we should not use this equation to estimate average August temperature at the equator.

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