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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 1sample ztest mean SRS Normal pop. Or large n (n> 40) Know 1sample ttest 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 2sample ztest 2sample ttest 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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 Fall '08
 AKBAS
 Statistics, Formulas, Normal Distribution, Standard Deviation, AP Statistics, Summer Institute

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