An economist discovers that over the past several years, both the salaries of U.S. college professors and
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An economist discovers that over the past several years, both the salaries of U.S.
college professors and the amount of beer consumed in the United States have gone up. Thus, there is a positive correlation between the average salary of college professors and the amount of beer consumed. The economist concludes that the increase in beer consumption must be caused by professors spending their additional money on beer. Explain why this conclusion is not necessarily true.
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