day2 - • Instead, we collect data on a smaller group. 2...

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How do we generate data? 1. Existing Sources Company databases Companies that specialize in data collection Special interest organizations Internet Government agencies 2. Statistical Studies Experimental Study Observational Study 1
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Which source should you use? Note : Beware of errors in data. Descriptive Statistics Data is summarized and presented in a form that is easy for a reader to understand. These summaries may be tabular, graphical, or numerical. Statistical Inference Suppose we want to draw conclusions about a large group of people (Americans, college students, women). It is impractical to collect data on every member of this group.
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Unformatted text preview: • Instead, we collect data on a smaller group. 2 Some terminology: • The population is the set of all elements of interest in a particular study. • The process of collecting data on the entire population is a census . • A sample is a subset of the population. • The process of collecting data on a sample is called a sample survey . **The process of using data collected on a sample to draw conclusions about a population is called statistical inference .** Example : Gallup asked 233 U.S. adults with children in kindergarten through grade 12 “Are you satisfied with your own child’s education?” 3...
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This note was uploaded on 01/24/2011 for the course STATISTICS 19897 taught by Professor Jager,abigaill during the Fall '10 term at Kansas State University.

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day2 - • Instead, we collect data on a smaller group. 2...

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