'Level confidence interval' diaporamas de présentation

Review: Large Sample Confidence Intervals

n >30 or so for means, np and n(1-p) both > 5 for proportions. Review: Large Sample Confidence Intervals. 1- a confidence interval for a mean: x +/- z a /2 s/sqrt(n) 1- a confidence interval for a proportion: p +/- z a /2 p(1-p)/sqrt(n)

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Review: Large Sample Confidence Intervals

n >30 or so for means, np and n(1-p) both > 5 for proportions. Review: Large Sample Confidence Intervals. 1- a confidence interval for a mean: x +/- z a /2 s/sqrt(n) 1- a confidence interval for a proportion: p +/- z a /2 p(1-p)/sqrt(n)

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Chapter 21

Chapter 21. What Is a Confidence Interval?. Recall from previous chapters:. Parameter fixed, unknown number that describes the population Statistic known value calculated from a sample a statistic is used to estimate a parameter Sampling Variability

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Welcome Back

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