chapter2 - Chapter 2 Collecting Data with Surveys and...

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Chapter 2 Collecting Data with Surveys and Scientific Studies
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Surveys Instruments used to obtain demographic characteristics and attitudes or behavioral tendencies from subjects Passive in nature, obtaining “naturally occuring” information Many fields conduct surveys regularly: Public Opinions : Gallup, CNN, WSJ, TV Networks Government Bureaus: Census, Labor Statistics Business: Customer satisfaction, Quality, Practices Recreation : State parks and wildlife area usage
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Sampling Methods Simple Random Sampling : Frame listing all N elements of population exists. Random numbers used to obtain a sample of n elements such that all samples of size n had equal chance of selection Stratified Random Sampling : Population split into homogeneous groups (strata) based on auxiliary variable(s) such as gender, income, race. Simple random samples taken from each stratum. Cluster Sampling : Population broken into set of clusters (often based on location), and sample of clusters are selected, with all elements in sampled cluster measured Systematic Sampling : Element selected at random near top of list, then every k th element subsequently measured
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Survey Problems Nonresponse : If people who do not respond tend to
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This note was uploaded on 06/04/2011 for the course STA 6166 taught by Professor Staff during the Fall '08 term at University of Florida.

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chapter2 - Chapter 2 Collecting Data with Surveys and...

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