# PracticeQuestions3Answers - 1. B 2. D 3. a. 0.16 + 0.14 +...

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Unformatted text preview: 1. B 2. D 3. a. 0.16 + 0.14 + 0.04 = 0.34 b. 0.17 + 0.16 = 0.33 c. 0.23 + 0.17 + 0.16 + 0.14 + 0.04 = 0.74 d. 1 – P ( X = 6) = 1 – 0.04 = 0.96 4. ( ) X x xP x μ = = 2.97 2 2 2 2 ( ) 11.49 (2.97) 2.6691 X X x x P x σ μ =- =- = ; hence 1.6337 x σ = 5. λ = 4.2 , P ( X = 3) = 0.185 6. λ = nP = 7.5, then P ( X >3) = 1 – P ( XX 3) = 1 – (0.0006+0.0041+ 0.0156 + 0.0389) = 0.94 7. Cov( , ) ( , ) X Y X Y xyP x y μ μ =- = 5.35 – (2.31)(2.36) = -0.10 8. a. ANSWER: x 1 2 3 P ( x ) 0.17 0.38 0.45 b. ANSWER: ( 29 2.28 X x P x μ = = & c. ANSWER: ( 29 ( 29 2 2 2 2 5.74 2.28 0.5416 X X x P x σ μ =- =- = . Hence, X σ =0.7359. d. ANSWER: y 1 2 P ( y ) 0.28 0.26 0.46 e. ANSWER: ( 29 1.18 Y y P y μ = & f. ANSWER: ( 29 ( 29 2 2 2 2 2.10 1.18 0.7076 Y Y y P y σ μ =- =- = . Hence, 0.8412 Y σ = . g. ANSWER: Cov( X , Y )= ( 29 , X Y x y xyP x y μ μ- =2.94-(2.28)(1.18)=0.2496 h. ANSWER: ρ = Corr( X , Y ) = ( 29 ( 29 ( 29 Cov , 0.2496 0.4032 0.7359 0.8412 X Y x y σ σ = = i....
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## This homework help was uploaded on 04/08/2008 for the course ECON 329 taught by Professor Yilmaz during the Spring '08 term at University of Texas.

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PracticeQuestions3Answers - 1. B 2. D 3. a. 0.16 + 0.14 +...

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