MATH 1342 CHAPTER 9 HANDOOUT

# MATH 1342 CHAPTER 9 HANDOOUT - 2 R column use 2 N/A 2 2 2 2...

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CONFIDENCE INTERVAL SUMMARY SITUATION GIVEN’S FINDING CRITICAL VALUE MARGIN OF ERROR CONFIDENCE INTERVAL Want C.I. for x with known σ . Confidence Level, x , σ ,n. 2 (1 2) Invnorm α α Ζ = - . 2 * E Z n α σ = ( 29 , x E x E - + Calculator: ZInterval Want C.I. for x with unknown σ . Confidence Level, x , s, n. Use t-table. For the row use the degrees of freedom. For the column use 2 α . 2 * s E t n α = ( 29 , x E x E - + Calculator: TInterval Want C.I. population for µ p (proportion) Confidence Level, ˆ p , n. 2 (1 2) Invnorm α α Ζ = - . 2 ˆ ˆ (1 ) * p p E Z n α - = ( 29 ˆ ˆ , p E p E - + Ca1culator: 1-PropZint Want C.I. for s Confidence Level, s, n. Use 2 χ table. For the row use the degrees of freedom.

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Unformatted text preview: 2 R column, use 2 . N/A 2 2 2 2 ( 1) ( 1) , R L n s n s -- Ã· Ã· NOTES: 1. Confidence Level = (1- 29 . 4. 2 high low CI CI x + = CONFIDENCE INERVAL (1- Î±) Î± Î±/2 2 Z 0.80 0.20 0.100 1.282 0.90 0.10 0.050 1.645 0.95 0.05 0.025 1.960 0.99 0.01 0.005 2.576 2. Degrees of freedom ( 1) n-. 5. 2 high low CI CI E-= 3. For proportions, given a desired error then 2 2 Ë† Ë† (1 ) Z n p p E Î± =- Ã· Ã· rounding up....
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