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Females, it is said, make 70 cents to the dollar in the United States. To investigate this
phenomenon, you collect data on weekly earnings from 1,744 individuals, 850 females
and 894 males. Next, you calculate their average weekly earnings and find that the
females in your sample earned $346.98, while the males made $517.70.

(a) Calculate the female earnings in percent of the male earnings. How would you test whether or not this difference is statistically significant?

(b) A peer suggests that this is consistent with the idea that there is discrimination against females in the labor market. What is your response?

(c) You recall from your textbook that additional years of experience are supposed to result in higher earnings. You reason that this is because experience is related to “on the job training.” One frequently used measure for (potential) experience is “Age-Education-6.” Explain the underlying rationale. Assuming, heroically, that education is constant across the 1,744 individuals, you consider regressing earnings on age and a binary variable for gender. You estimate two specifications initially:

= 323.70 + 5.15 Age – 169.78 Female, =0.13
(21.18) (0.55) (13.06)

= 5.44 + 0.015 Age – 0.421 Female, =0.17
(0.08) (0.002) (0.036)

where Earn are weekly earnings in dollars, Age is measured in years, and Female is a binary variable, which takes on the value of one if the individual is a female and is zero otherwise. Interpret each regression carefully. For a given age, how much less do females earn on average?

(d) Can you choose which is the best specification based on the R2 information? Which test would you perform to decide between the two specifications? Describe the test in details.

(e) Your peer points out to you that age-earning profiles typically take on an inverted U-shape. To test this idea, you add the square of age to your log-linear regression.

= 3.04 + 0.147 Age – 0.421 Female – 0.0016 ,
(0.18) (0.009) (0.033) (0.0001)
=0.28

Interpret the results again. Are there strong reasons to assume that this specification is superior to the previous one? Why is the increase of the Age coefficient so large relative to its value in (c)?

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