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Unformatted text preview: have had one of each sex for their first two children. Since the t-statistic is 35.17, it is significant. d. The reason samesex is a valid instrument is because it is independent from the endogenous variable Weeksworked , but correlated with the variable Morekids . e. Samesex is not a weak instrument because it is a significant statistic that correlates with Morekids . f. Couples who have had the same sex for their first two children are likelier to work an average of 6.31 weeks less than couples who have had one of each sex for their first two children. g. The results are not important because having the same sex for your first two children is a completely random process and therefore samesex is independent from agem1, black, hispan, and otherace....
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- Winter '08