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Unformatted text preview: parameter A 95% CI means we use an alpha of .05, with 5% risk of Type I error II. Calculating Confidence Intervals o CI = ± z x (s/ n ) o If alpha = .05, z α =1.96 – this is a 95% CI o If alpha = .01, z α =2.58 – this is a 99% CI o To find z α , we look in table E2 for the z score that corresponds to α/2 o Ex. II. Confidence intervals o The confidence interval is a range (negative and positive) around our sample statistic o How many standard errors we go out from the statistic depends on the confidence level we select o To increase out confidence in out interval, use a larger CI or a larger sample o...
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 Spring '09
 Kupchick
 Statistics, Normal Distribution, Probability distribution

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