two sample inferences

two sample inferences - Two Sample Inferences • Comparing...

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Unformatted text preview: Two Sample Inferences • Comparing two population means (pages 2-5) • Comparing two population proportions (page 6) 1 Two Sample Inferences for Means Independent Samples Paired Experiments Large Samples (n 1 ,n 2 30) ≥ Small Samples (n 1 < 30 and/or n 2 < 30) Large Samples (# Pairs 30) ≥ Small Samples (# Pairs < 30) Equal Variances ( ) Unequal Variances ( ) 2 2 2 2 1 σ σ σ = = 2 2 2 1 σ σ ≠ Unequal Sample Sizes ( ) Equal Sample Sizes ( ) 2 1 n n ≠ n n n = = 2 1 Unequal Sample Sizes ( ) Equal Sample Sizes ( ) 2 1 n n ≠ n n n = = 2 1 2 (Page 3) (Page 4) (Page 5) (Page 5) Independent Two-Sample Inferences for Means – Large Samples 2 2 2 1 2 1 2 1 2 1 2 2 2 1 2 1 2 / 2 1 ) ( 2 / 2 1 2 2 2 1 2 1 2 2 2 1 2 1 ) ( : : ) ( ) ( 2 1 2 1 n s n s D x x z Statistic Test D H Testing Hypothesis n s n s z x x z x x CI n s n s n n x x x x +-- = =- + ±- ≈ ±- = + ≈ + =-- μ μ σ σ σ σ α α 3 Independent Two-Sample Inferences for Means – Small Samples* * Assumptions: (1) Both populations are Normal. (2) Samples are selected randomly and independently. * Assumptions: (1) Both populations are Normal....
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This note was uploaded on 12/07/2011 for the course BIO 113 taught by Professor Staff during the Fall '09 term at Rutgers.

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two sample inferences - Two Sample Inferences • Comparing...

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