Economics 140A
Fall 2011
Professor Startz
Sketched Out Final Exam Answers
Note that not all the details are shown here. The sketches here are just to point you in the right
direction. A good exam answer would have more details.
1.
Since the coefficient on SUM is 1.876 losing three yeses is predicted to lower the vote by
There are
degrees of freedom. The critical value from the
t
table is 2.028. So the 95 percent confidence interval is
(
)
(
)
.
With 9 yeses the forecast is
. The critical value for a 99%
confidence interval is 2.719. The variance of the forecast is
. The standard error is
√
So the 99 percent confidence interval is
(
)
2.
The estimated marginal effect is
.
The second question calls for an
F
test.
(
)
(
)
(
)
Since the critical value at the 5 percent level is 3.00, we strongly reject.
3.
We have
̂
(
) (
) (
)
( ̂)
(
) (
) (
)
( ̂) (( ̂ ( ̂))
) ((
)
)
( (
) (
) (
) ( (
) (
) (
))
4.
In the first regression the Durbin
Watson isn’t very high. While the table doesn’t go up
to as many observations as we have, you would probably reject no serial
correlation…but not very strongly. In contrast, the Breusch
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 Spring '08
 Staff
 Economics, Econometrics, Normal Distribution, Regression Analysis, Variance, Prediction interval, Statistical terminology, percent confidence interval

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