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Unformatted text preview: AP Statistics Chapter 12 Section 1 Means vs. Proportions • Compare means when you are working with quantitative variables. • Compare proportions when you are working with categorical variables. Important stuff ( 29 = = = = = = * ˆ ˆ 1 ˆ # # ˆ p p p p n p p SE ns observatio successes p Population proportion Sample proportion A specific value used to replace the unknown p to test the null hypothesis. Usually 0.5 ( 29 ( 29 n p p p p z p p H n p p z p 1 ˆ : ˆ 1 ˆ * ˆ = =  ± Confidence Interval formula for 1proportion Test of significance for 1 proportion 1proportion • SRS from a pop of interest • Pop > 10(n) • Test of Sign. • C.I. 2proportion ( 29 n p p z p ˆ 1 ˆ * ˆ ± ( 29 n p p p p z 1 ˆ = ( 29 10 1 10 ≥ ≥ p n np ( 29 10 ˆ 1 10 ˆ ≥ ≥ p n p n 1  proportion • How common is the behavior that puts people at risk of AIDS? 2673 random heterosexual adults were interviewed. Of these 170 had more than one sexual partner in the past year. Based on the data, what conclusions can be drawn regarding the percent of adult heterosexuals who have multiple partners? 2 proportions...
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This note was uploaded on 04/10/2011 for the course MATH 1070 taught by Professor Akbas during the Fall '08 term at Georgia State.
 Fall '08
 AKBAS
 Statistics, AP Statistics

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