1. Supposeyou are given the following information:
n= 6 ∑xi = 31 ∑yi = 172 ∑xiyi = 980 ∑xi2 = 205 ∑yi2 = 5162
(a) Find the equation of the sampleregression line. What does this linetell us?
(b) The RSS = 45.2691. What does the RSS tell us in general?
(c) Find S2. What does the S2 tell us ingeneral?
(d) Calculate R2. Is this linear model appropriate forexplaining the values of y?
(e) Calculate a 95% confidence interval forβ2.
(f) Test H0: β2 =0 against H1: β2 > 0 using the 5% level ofsignificance.
2. Explain the difference between the 95%confidence interval for the expected value of the dependent variable given anew observation of the independent variable and the 95% confidence interval forthe actual value of the dependent variable given this new observation on the independent variable.
3. The following equation has been estimatedas:
Yt = 15.5 + 2.3lnX2t+ 0.45(1/X3t) + 1.2Zt
Find the following:
(a) Marginal effect of X3 on Y.
(b) Elasticity of Y with respect to Z.
4. Given the followinginformation:
(Standard errors are in parentheses) n = 82 |
Variable | Model A | Model B |
Constant | 54.4 | 71.554 |
| (23.19) | (19.93) |
X2 | -0.383 | -0.403 |
| (0.117) | (0.118) |
X3 | -0.741 | -0.839 |
| (0.43) | (0.42) |
X4 | 2.148 | 2.227 |
| (0.43) | (0.31) |
X5 | 1.046 | |
| (0.691) | |
X6 | 0.194 | |
| (0.20) | |
| | |
RSS | 2309.978 | 2414.724 |
 | .576 | .568 |
R2 | .602 | .584 |
S2 | 30.394 | 30.958 |
12 (a) Test the overall level of significance ofModel B at a 1% level.
State theNull and the Alternative hypotheses and the statistical distribution of thetest statistic.
12 (b) Test the joint significance of variables X5and X6 at the 5% level.
State theNull and the Alternative hypotheses and the statistical distribution of thetest statistic.
5. (a) Whatare the properties of the Ordinary LeastSquares regression coefficients?
(b) What does the p-value of a regressioncoefficient tell us?
(c) What is the R2? How is it a measure of the goodness of fit?
(d) In the model Y = β1 + β 2X2+ β 3X3 + u, explain the ways in which the restriction
β2 = β 3 could betested.
6. Supposeyou are given the following information:
Model 1 lnYt = 4.99 +23.2D1 + 36.5D2 + .732 lnX2 –2.798 D1lnX2 + 4.251 D2ln X2 – .371X3
+.405D1lnX3 – .236 D2lnX3 adjusted R2= .921, RSS = .018645
Model 2 lnYt = 4.18 +.103D1 + .103D2 + .621 lnX2 – .201 lnX3
adjusted R2= .852, RSS = .04195
Where n = 29 D1 = 1 for observations 12to 20, (period 2) and 0 otherwise.
D2 = 1 for observations 21 to29, (period 3) and 0 otherwise
(a) What are the elasticities of Y withrespect to X2 and X3 in period 1, 2, and 3
(c) How can one test the Null Hypothesisthat there has been no structural change in the elasticities of Y with respect to X2 and X3over the three time periods, observations 1 – 11, 12 – 20, and 21 – 29?
Writeout the null and alternative hypotheses interm of the B’s.
Calculatethe test statistic, and it’s distribution.
Carryout the test and the 1% level.
Whatis the result?
要期中考试了,老师给了些模拟题,但不讲也不给答案,有些题不知道对错的。。。。求大神帮忙做下,非常感谢