Consider a simple linear regression model, wage = 
+ ![]()
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A. Linear in parameters
B. Random sampling
C. Sample variation in the explanatory variable
D. Zero conditional mean
Answer: D
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a. only in less-developed economies b. only in rural areas c. only in urban areas d. in every large city in the United States e. in some of the largest U.S. cities
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a. coal b. ice cream c. lumber d. oil