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Unformatted text preview: ααχ ⋅ χ ⋅ 2 2 1 2 2 2 2 s s 1 , 1 n n . 95% confidence level α = 0.05 α 2 = 0.025 . n1 = 10 1 = 9 degrees of freedom. 2 025 2 2 . χ χ = α = 19.02. 2 975 2 2 1 . χ χ = α= 2.700. ( ) ( ) ⋅ ⋅ 700 . 2 9 . 1 10 , 02 . 19 9 . 1 10 2 2 ( 0.619 , 1.643 ) 1. (continued) c) (3) What is the minimum sample size required if we wish to estimate the overall average height of adult male giraffes to within 0.2 feet with 90% confidence, if the overall standard deviation of the heights is 0.8 feet? ε = 0.2 σ = 0.8 α = 0.10 z 0.05 = 1.645 2 2 2 2 . 8 . 645 . 1 α ε σ z = = ⋅ ⋅ n = 43.2964. Round up. n = 44 ....
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This note was uploaded on 11/28/2011 for the course STAT 400 taught by Professor Kim during the Spring '08 term at University of Illinois, Urbana Champaign.
 Spring '08
 Kim

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