POS 3713 EXAM 4 QUESTIONS & ANSWERS
*1. Which of the following statements are accurate about the population regression
model?*
(a) u_i is the stochastic component of Yi.
(b) a^ + B^Xi is the systematic component of Yi.
(c) Both (a) and (b) are correct.
(d) Neither (a) nor (b) are correct. - Answers -C
*2. Which of the following statements are accurate?*
(a) u^i is an estimate of ui.
(b) X_i is assumed to be measured without error.
(c) Both (a) and (b) are correct.
(d) Neither (a) nor (b) are correct. - Answers -C
*3. Which of the following statements are accurate?*
(a) E(ui) = 0
(b) E(ui2) = 0
(c) Both (a) and (b) are correct.
(d) Neither (a) nor (b) are correct. - Answers -A
*4. Which of the statements are accurate?*
(a) By specifying a bivariate regression model we are assuming that the impact of a one
unit increase in X_i will always be β.
(b) By specifying a bivariate regression model we are assuming that there are no other
variables that cause Y_i.
(c) Both (a) and (b) are correct.
(d) Neither (a) nor (b) are correct. - Answers -C
*5. Which of the following statements are accurate?*
(a) In order to estimate a bivariate regression model, you must have at least two cases.
(b) If X_i=4 for all observed X_i you can estimate a bivariate regression model.
(c) Both (a) and (b) are correct.
(d) Neither (a) nor (b) are correct. - Answers -D
*6. Which of the following statements are accurate?*
(a) In hypothesis testing from a bivariate regression model, our conclusions do not
depend on whether or not we have a directional hypothesis.
(b) The null hypothesis for any hypothesis test about β will be that β=0.
(c) Both (a) and (b) are correct.
(d) Neither (a) nor (b) are correct. - Answers -D
*7. In this example, if an individual has judged that Iraq war is a complete failure,
meaning that they have a value of 0 for the independent variable, what would be their
expected value for "Blair Feelings?"*
, (a) 0
(b) 5.00
(c) 4.70
(d) 0.31 - Answers -C
*8. Which of the following statements are accurate?*
(a) For every one-unit increase in "Blair Feelings", we can expect to see a 0.31 increase
in "Iraq War Success Scale."
(b) For every one-unit increase in "Iraq War Success Scale", we can expect to see a
0.31 increase in "Blair Feelings."
(c) If the variable "Blair Feelings" is zero, it is highly likely that the variable "Iraq
War Success Scale" will also be equal to zero.
(d) None of the above. - Answers -B
*9. Which of the following statements are accurate?*
(a) It is highly unlikely that we would see the relationship that we are seeing between
the independent variable and the dependent variable in this model due to random
chance.
(b) This model explains about 90% of the variation in "Blair Feelings."
(c) Both (a) and (b) are correct.
(d) Neither (a) nor (b) are correct. - Answers -A
*10. Which of the following statements are accurate?*
(a) With these results, if we know the value of "Iraq War Success Scale" then we will be
able to predict the value of "Blair Feelings." Our predictions will on average be off by
2.337.
(b) Even if an individual feels very negatively about how the Iraq war is going, they are
quite unlikely to have the worst possible judgment about Tony Blair's competence.
(c) Both (a) and (b) are correct.
(d) Neither (a) nor (b) are correct. - Answers -C
*11. What is the principal goal of multiple regression in social-scientific research?*
(a) To validate the results of an experiment by applying it to a separate sample of data.
(b) To attempt to cross the second causal hurdle - that is, to see if Y might cause X.
(c) To maximize the likelihood that our sample is representative of the population as a
whole, thus making our findings statistically significant.
(d) To test whether X causes Y in observational research while controlling for other
causes of Y. - Answers -D
*12. The statistical problem "bias" is defined as:*
(a) The problems that often result from a measure being faulty.
(b) The expected value of the parameter estimate that we obtain from a sample will not
be equal to the true population parameter.
(c) The researcher had predetermined the "conclusions" of her or his research before
beginning the analysis, thereby affecting the results.
*1. Which of the following statements are accurate about the population regression
model?*
(a) u_i is the stochastic component of Yi.
(b) a^ + B^Xi is the systematic component of Yi.
(c) Both (a) and (b) are correct.
(d) Neither (a) nor (b) are correct. - Answers -C
*2. Which of the following statements are accurate?*
(a) u^i is an estimate of ui.
(b) X_i is assumed to be measured without error.
(c) Both (a) and (b) are correct.
(d) Neither (a) nor (b) are correct. - Answers -C
*3. Which of the following statements are accurate?*
(a) E(ui) = 0
(b) E(ui2) = 0
(c) Both (a) and (b) are correct.
(d) Neither (a) nor (b) are correct. - Answers -A
*4. Which of the statements are accurate?*
(a) By specifying a bivariate regression model we are assuming that the impact of a one
unit increase in X_i will always be β.
(b) By specifying a bivariate regression model we are assuming that there are no other
variables that cause Y_i.
(c) Both (a) and (b) are correct.
(d) Neither (a) nor (b) are correct. - Answers -C
*5. Which of the following statements are accurate?*
(a) In order to estimate a bivariate regression model, you must have at least two cases.
(b) If X_i=4 for all observed X_i you can estimate a bivariate regression model.
(c) Both (a) and (b) are correct.
(d) Neither (a) nor (b) are correct. - Answers -D
*6. Which of the following statements are accurate?*
(a) In hypothesis testing from a bivariate regression model, our conclusions do not
depend on whether or not we have a directional hypothesis.
(b) The null hypothesis for any hypothesis test about β will be that β=0.
(c) Both (a) and (b) are correct.
(d) Neither (a) nor (b) are correct. - Answers -D
*7. In this example, if an individual has judged that Iraq war is a complete failure,
meaning that they have a value of 0 for the independent variable, what would be their
expected value for "Blair Feelings?"*
, (a) 0
(b) 5.00
(c) 4.70
(d) 0.31 - Answers -C
*8. Which of the following statements are accurate?*
(a) For every one-unit increase in "Blair Feelings", we can expect to see a 0.31 increase
in "Iraq War Success Scale."
(b) For every one-unit increase in "Iraq War Success Scale", we can expect to see a
0.31 increase in "Blair Feelings."
(c) If the variable "Blair Feelings" is zero, it is highly likely that the variable "Iraq
War Success Scale" will also be equal to zero.
(d) None of the above. - Answers -B
*9. Which of the following statements are accurate?*
(a) It is highly unlikely that we would see the relationship that we are seeing between
the independent variable and the dependent variable in this model due to random
chance.
(b) This model explains about 90% of the variation in "Blair Feelings."
(c) Both (a) and (b) are correct.
(d) Neither (a) nor (b) are correct. - Answers -A
*10. Which of the following statements are accurate?*
(a) With these results, if we know the value of "Iraq War Success Scale" then we will be
able to predict the value of "Blair Feelings." Our predictions will on average be off by
2.337.
(b) Even if an individual feels very negatively about how the Iraq war is going, they are
quite unlikely to have the worst possible judgment about Tony Blair's competence.
(c) Both (a) and (b) are correct.
(d) Neither (a) nor (b) are correct. - Answers -C
*11. What is the principal goal of multiple regression in social-scientific research?*
(a) To validate the results of an experiment by applying it to a separate sample of data.
(b) To attempt to cross the second causal hurdle - that is, to see if Y might cause X.
(c) To maximize the likelihood that our sample is representative of the population as a
whole, thus making our findings statistically significant.
(d) To test whether X causes Y in observational research while controlling for other
causes of Y. - Answers -D
*12. The statistical problem "bias" is defined as:*
(a) The problems that often result from a measure being faulty.
(b) The expected value of the parameter estimate that we obtain from a sample will not
be equal to the true population parameter.
(c) The researcher had predetermined the "conclusions" of her or his research before
beginning the analysis, thereby affecting the results.
