two sample inferences

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

This preview shows pages 1–5. Sign up to view the full content.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

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....
View Full Document

{[ snackBarMessage ]}

### Page1 / 6

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

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online