Sketched out answers Final Econ140A 2011Fall

# Sketched out answers Final Econ140A 2011Fall - Economics...

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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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