Quiz 2 Sketched out answers Econ140A 2013Fall

# Quiz 2 Sketched out answers Econ140A 2013Fall - Economics...

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Economics 140A Fall 2013 Professor Startz Sketched Out Quiz 2 Note that not all the details are shown here. The sketches here are just to point you in the right direction. A good exam answer would have more details. Question 1 (a) The average number of hours worked for unmarried males -- the left out categories (b) 25.35 hours (c) -2.2+-10.7=-12.9 hours (married females work 12.9 hours less than unmarried females) (d) , married women, on average, work 2.67 hours more than unmarried women Question 2 (a) Let’s rewrite this equation as: For this question, we can use a two-sided t-test. The t-statistic is: The critical value for a two tailed test at the 1 percent level with 87,334-8 degrees of freedom is 2.576. | | so fail to reject the null hypothesis.

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page 2 2 (b) For this question, we can use a two-sided t-test. Because there is no differential effect of education by race in this model (no coefficient for BLACK*ED or ASIAN*ED), the hypothesis test is: The t-statistic is: ( ) | | so reject the null hypothesis. (You could also set up , in which case the t-statistic would be positive and you would still reject the null.)
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