19. 
In this regression, I look at the determinants of years of schooling S for a respondent as a function of the following: an intelligence score (ASVABC); mother's years of schooling (SM); father's years of schooling (SF); a FEMALE dummy variable =1 if female; some race dummy variables where there are only 3 ethnicities listed in the data: ETHWHITE, ETHBLACK, ETHHISP; an interaction term FEMBLACK where (FEMALE ETHBLACK), and another interaction term FEMHISP where (FEMALE ETHHISP).
I also do an additional test to determine the importance of adding the parents' schooling The results are attached.
Question: Are SM and SF significant for explaining years of S at d=1%?
Answer: The test statistic is and the conclusion is
where 1=yes and O=no.
test statistic = 29.71
"Yes"
since p<5%, i can say that Sm and Sf are significant predictors of years of S
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