Ex 2.6 - 0.144 2 0.0004 0.0032 0.0064 d), 0.144; e),...

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Exercise 2.6 1. b): Covariance = -0.1; Correlation = -0.0045; c): No, correlation is almost zero. 3. Covariance = -0.0451; Correlation = -0.0816; 5. a), E(X) = E(Y) = 2, because both are symmetric; b), σ X = 1.353, σ Y = 1.285 c), -0.7; d), -0.403, Not independent; 7. a), positive; b), x 0 1 2 P(X=x) 0.81 0.18 0.01 c), Y X 0 1 2 0 0.81 0 0 1 0.036
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Unformatted text preview: 0.144 2 0.0004 0.0032 0.0064 d), 0.144; e), 0.8847; 9. yes 11. The correlation is misleadingly high since the data is based on averages of countries. See observation 4. Also there could be confounding factors. 13. One with the whole year data. See observation 5. 1...
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This note was uploaded on 05/30/2010 for the course MATH 218 taught by Professor Haskell during the Spring '06 term at USC.

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