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

Using the regression results in column (2):

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

b. Sally is a 29-year-old female college graduate. Betsy is a 34-year-old female college graduate. Construct a 95% confidence interval for the expected difference between their earnings.

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