28. Randomized, controlled experiments are needed to accurately measure treatment effects without(a) the expense of having to treat everyone.(b) raising public debate.(c) exposing everyone to untested treatments.(d) omitted-variable bias.29. The following economic model predicts whether a voter will vote for an incumbent school boardmemberINCUMBENT=β1+β2MALE+β3PARTY+β4MARRIED+β5KIDS,whereINCUMBENT= 1 if the voter votes for them, 0 otherwise.MALE= 1 if the voter is a male.PARTY= 1 if the voter is registered with the same political party as the incumbent.MARRIED= 1 for married voters, 0 otherwise.KIDSis the number of school age children living in the voter’s house.If you believe marriage affects male and female voters differently, which variable should you addto the economic model to allow you to test the hypothesis?30. Consider the same setup as in the previous question. Suppose it is claimed that a married manis less devoted to the incumbent than a married woman. Then the results must have31. Consider the following regression model given byyi= 1.1 + 2xi2+.5xi3+ei8

The standard error for 2b2+b3is(a) 1.22(b) 0.43(c) 0.39(d) 0.1132. You have estimated the following equation:TestScorei= 607.3 + 3.85Incomei-0.0423Income2i(2)where TestScore is the average of the reading and math scores on the Stanford 9 standardized testadministered to 5th grade students in 420 California school districts in 1998 and 1999. Incomeis the average annual per capita income in the school district, measured in thousands of 1998dollars. The equation9

Part III Demand for Meat (each question worth 2 points)This question refers to the output labelled “The Demand for Meat” provided in theSTATA Output.Note that the stata command ”matrix list e(V)” is the same as ”estat vce”.39. TheF-statistic forH0:β2=β3=β4= 0 from the first regression is (approximately):40. The results indicate that

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- Winter '07
- SandraBlack
- Econometrics, Regression Analysis, Yi