Question: 7.4 Using the regression results in column (3): a. Do there appear to be important regional differences? Use an appropri- ate hypothesis test to

7.4 Using the regression results in column (3): a. Do there appear to be important regional differences? Use an appropri- ate hypothesis test to explain your answer. b. Juanita is a 28-year-old female college graduate from the South. Molly is a 28-year-old female college graduate from the West. Jennifer is a 28-year-old female college graduate from the Midwest. i. Construct a 95% confidence interval for the difference in expected earnings between Juanita and Molly. ii. Explain how you would construct a 95% confidence interval for the difference in expected earnings between Juanita and Jennifer. (Hint: What would happen if you included West and excluded Midwest from the regression?)

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