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# ex3_2010ak - Sociology 63993—Exam 3 Answer Key—Page 1 S...

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Unformatted text preview: Sociology 63993—Exam 3 Answer Key—Page 1 S o c i o l o g y 6 3 9 9 3 E x a m 3 A n s w e r K e y M a y 4 & 7 , 2 0 1 0 I. True-False. (20 points) Indicate whether the following statements are true or false. If false, briefly explain why. 1. The use of standardized coefficients is one way to effectively deal with problems of random measurement error in variables. False. If anything standardization will make problems worse. When random variability is added to the dependent variable, its variance increases and the standardized effects go down (because their computation involves the variance of the DV). Estimates of the underlying structural relationships (i.e. the non-standardized coefficients) are not biased by random measurement error in the DV though. 2. Robust regression techniques should be used to estimate nonrecursive models. False. 2sls is a method for estimating nonrecursive models. 3. The log odds of an event occurring are 0. This means that the event cannot happen. False. If the log odds are 0, the odds are 1, and the probability of the event occurring is 50 percent. 4. Y is regressed on X in two different populations. In both populations, the estimated Beta coefficient equals 3. This means that the R 2 value will also be the same in the two populations. False. The value of R 2 is also affected by the variance of the exogenous variable and the residual variance. 5. After running an ordered logit model, a researcher obtains the following: . brant Brant Test of Parallel Regression Assumption Variable | chi2 p>chi2 df -------------+-------------------------- All | 49.18 0.000 12 -------------+-------------------------- yr89 | 13.01 0.001 2 male | 22.24 0.000 2 white | 1.27 0.531 2 age | 7.38 0.025 2 ed | 4.31 0.116 2 prst | 4.33 0.115 2 ---------------------------------------- These results suggest that the assumptions of the model have been violated in this analysis. True. If the assumptions are not violated you will get small chi-square values. Violations are especially severe for male and yr89. Sociology 63993—Exam 3 Answer Key—Page 2 II. Short answer . (25 pts each, 50 pts total). Answer both of the following. II-1. (25 points): After several setbacks in recent elections, supporters of gay marriage are cautiously optimistic about their prospects for the future. A small but growing number of states have legalized gay marriage. In January 2010, Ted Olson (George Bush’s attorney in Bush versus Gore 2000) surprised many by writing an article for Newsweek entitled The conservative case for gay marriage . A February 2010 study by the Pew Research Center found that young adults were much less opposed to gay marriage than were older generations....
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ex3_2010ak - Sociology 63993—Exam 3 Answer Key—Page 1 S...

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