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AP+Statistics+Chapter+11+Section+1

# AP+Statistics+Chapter+11+Section+1 - AP Statistics Chapter...

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Unformatted text preview: AP Statistics Chapter 11 Section 1 ± n z x σ * n x z H σ μ μ μ :- = = Test Confidence Interval Formulas Assumptions 1-sample z-test mean SRS Normal pop. Or large n (n> 40) Know 1-sample t-test mean (could also be used for a matched pairs design) SRS < 15 -- very normal 15 < n < 40 -- can be used except in the presence of outliers or strong skewness > 40 -- use regardless of normality 2-sample z-test 2-sample t-test σ n s t x * ± 1 ) (- =- = n k n s x k t μ Unrealistic Assumption, known σ μ Assumptions we make in order to do inference about a population mean: 1. SRS 2. Observations from the population have a normal distribution with mean and standard deviation . Both are unknown parameters. σ S n s x N n N , , σ μ Because we do not know the true population standard deviation we estimate with the sample standard deviation, s....
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AP+Statistics+Chapter+11+Section+1 - AP Statistics Chapter...

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