Câu hỏi: What result is proved by the Gauss-Markov theorem?
A. That OLS gives unbiased coefficient estimates
B. That OLS gives minimum variance coefficient estimates
C. That OLS gives minimum variance coefficient estimates only among the class of linear unbiased estimators
D. That OLS ensures that the errors are distributed normally
Câu 1: Which one of the following is NOT an assumption of the classical linear regression model?
A. The explanatory variables are uncorrelated with the error terms
B. The disturbance terms have zero mean
C. The dependent variable is not correlated with the disturbance terms
D. The disturbance terms are independent of one another
30/08/2021 8 Lượt xem
Câu 2: Two researchers have identical models, data, coefficients and standard error estimates. They test the same hypothesis using a two-sided alternative, but researcher 1 uses a 5% size of test while researcher 2 uses a 10% test. Which one of the following statements is correct?
A. Researcher 2 will use a larger critical value from the t-tables
B. Researcher 2 will have a higher probability of type I error
C. Researcher 1 will be more likely to reject the null hypothesis
D. Both researchers will always reach the same conclusion
30/08/2021 8 Lượt xem
Câu 3: Which of the following statements is correct concerning the conditions required for OLS to be a usable estimation technique?
A. The model must be linear in the parameters
B. The model must be linear in the variables
C. The model must be linear in the variables and the parameters
D. The model must be linear in the residuals
30/08/2021 7 Lượt xem
Câu 4: Consider an increase in the size of the test used to examine a hypothesis from 5% to 10%. Which one of the following would be an implication?
A. The probability of a Type I error is increased
B. The probability of a Type II error is increased
C. The rejection criterion has become more strict
D. The null hypothesis will be rejected less often
30/08/2021 7 Lượt xem
Câu 5: Which of the following is a correct interpretation of a “95% confidence interval” for a regression parameter?
A. We are 95% sure that the interval contains the true value of the parameter
B. We are 95% sure that our estimate of the coefficient is correct
C. We are 95% sure that the interval contains our estimate of the coefficient
D. In repeated samples, we would derive the same estimate for the coefficient 95% of the time
30/08/2021 9 Lượt xem
Câu 6: Which of the following is NOT a good reason for including a disturbance term in a regression equation?
A. It captures omitted determinants of the dependent variable
B. To allow for the non-zero mean of the dependent variable
C. To allow for errors in the measurement of the dependent variable
D. To allow for random influences on the dependent variable
30/08/2021 8 Lượt xem

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