Exam 2 Answers

Exam 2 Answers - ECN 425 Form A Q1. Q2. (1) 1) b Key for...

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1 ECN 425 Key for the Second Exam DR. AHN Form A Q1. 1) b ; 2) b ; 3) a ; 4) a ; 5) c ; 6) b ; 7) b ; 8) b. Q2. (1) 1 1 2 3 ˆ 1/ 20 0 0 20 (1/ 20) 20 1 ˆˆ () 01 62 1 2 6 1 8 ˆ 0 6 37 1 6 2 37 1 49 XX XY               . (2) 22 120 20 1 100 TSS Y Y nY  ; ˆ 35 RSS Y Y X Y  ; 2 35 10 . 6 5 100 R . (3) (1,1,0); 1 R r . ˆ 1818 Rr  ; 0.3 0 0 1 ˆ (1,1, 0) 0 2 1 2.3 20 RR  . 12 ˆ ( ) 8 27.8 . 3 R RRr F  . Q3. (1) 1.397 6.1; 1.96 0.229 tc t c Reject 1 :0 o H . So, significant. (2) 2 138 138 0.177 4.323 140 2 138 RSS RSS SER SER RSS SER  . (3) Observe that 2 ˆ (coefficient of Educ) is significantly different from zero. It means that 1 ˆ from previous regression is upward biased. 2 cov( , ) ( ) cov( , ) ( ) KK bias Educ s Educ s  .
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Exam 2 Answers - ECN 425 Form A Q1. Q2. (1) 1) b Key for...

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