Chapter 12 - Chapter 12 Sample surveys ActivStats: 12 Read:...

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Chapter 12 Sample surveys ActivStats: 12 Read: Chapter 12 X 1 X 2 . . . X n POPULATION Population: the entire group of individuals or instances Distribution: model (e.g. normal curve N( μ , σ )) Parameter: numerical characteristic of a population model μ -population mean - population standard deviation ρ - correlation p - proportion SAMPLE Sample: a subset of a population Distribution: histogram, dotplot, etc. Statistic: a number computed from data x - sample mean s - sample standard deviation r – sample correlation p ˆ - sample proportion Vocabulary: Sampling Frame - a list of individuals from which a sample is selected Sampling Variability - each random sample is different Sampling Design - a method of taking a sample Sample Size – the number of elements in a sample
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If a goal is to estimate population parameters or distribution, a sample should represent the whole population and hence the sample individuals should be selected at random , so that each set of the same size has the same chance of being selected. A
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Chapter 12 - Chapter 12 Sample surveys ActivStats: 12 Read:...

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