13. For the following regression equation,
EARNINGS = 100 - 125 + 5EXP-5(S'EXP) - 6FEMALE
the marginal effect of a one unit increase in EXP, while holding S constant at a value of 4, decreases earnings on average by exactly dollars.
Recall:
S = years of schooling
EXP = years of experience
FEMALE = 1 for females, and otherwise
-5*4 = -20
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