Question: 7.3 Using the regression results in column (2): a. Is age an important determinant of earnings? Use an appropriate statistical test and/or confidence interval to

7.3 Using the regression results in column (2):

a. Is age an important determinant of earnings? Use an appropriate statistical test and/or confidence interval to explain your answer.

b. Suppose Alvo is a 30-year-old male college graduate, and Kal is a 40-year-old male college graduate. Construct a 95% confidence interval for the expected difference between their earnings.

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