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Lecture 11O

# Lecture 11O - Statistics 371-001 Sp 09 Lecture#11 26 Feb 09...

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Statistics 371-001, Sp 09 Lecture #11 26 Feb 09 Brief review of Lectures 9 (last part) and 10. Chapter 6 begins Inferential Statistics. We select a sample. Study the characteristics of that sample (mean, SD, shape). Use information from sample to learn something about the characteristics of the population. Inference about population based on sample. Statistical Estimation – a type of inferential statistic. Used sample mean to estimate population mean – point estimate. Can use interval. Confidence interval – range of values that probably contains the population value.

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y μ Y n n n y n Lecture 11 page Use sample statistics to estimate confidence intervals. to estimate or . Use standard deviation to estimate dispersion. Would use z table to determine critical standardized values for the percent confidence we want. But z requires σ. Don’t know σ , estimate using s . Learned in Ch 5 that
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Lecture 11O - Statistics 371-001 Sp 09 Lecture#11 26 Feb 09...

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