two sample inferences

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

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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 = = 2 2 2 1 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 +-- = =- + - - = + + =-- 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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two sample inferences - Two Sample Inferences Comparing two...

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