Soln to Ch 10

Soln to Ch 10 - 1 a x x 1 2 = 13.6 11.6 = 2 b 2.05 z z α =...

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Unformatted text preview: 1. a. x x 1 2- = 13.6 - 11.6 = 2 b. / 2 .05 z z α = = 1.645 2 2 1 2 1 2 1 2 1.645 x x n n σ σ- ± + 2 2 (2.2) (3) 2 1.645 50 35 ± + 2 ± .98 (1.02 to 2.98) c. / 2 .025 z z α = = 1.96 2 2 (2.2) (3) 2 1.96 50 35 ± + 2 ± 1.17 (.83 to 3.17) 2. a. ( 29 1 2 2 2 2 2 1 2 1 2 (25.2 22.8) 2.03 (5.2) 6 40 50 x x D z n n σ σ---- = = = + + b. p-value = 1.0000 - .9788 = .0212 c. p-value ≤ .05, reject H . 6. 1 μ = Mean loan amount for 2002 2 μ = Mean loan amount for 2001 H : 1 2 μ μ- ≤ H a : 1 2 μ μ- ( 29 1 2 2 2 2 2 1 2 1 2 (175 165) 2.17 55 50 270 250 x x D z n n σ σ---- = = = + + p-value = 1.0000 - .9850 = .0150 p-value ≤ .05; reject H . The mean loan amount has increased between 2001 and 2002. 9. a. 1 2 x x- = 22.5 - 20.1 = 2.4 b. 2 2 2 2 2 2 1 2 1 2 2 2 2 2 2 2 2 2 1 2 1 1 2 2 2.5 4.8 20 30 45.8 1 2.5 1 4.8 1 1 19 20 29 30 1 1 s s n n df s s n n n n + + = = = + + -- Use...
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Soln to Ch 10 - 1 a x x 1 2 = 13.6 11.6 = 2 b 2.05 z z α =...

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