Government agencies like the bureau of the census

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Unformatted text preview: Government agencies, like the Bureau of the Census make their data available through a web site. – (www.census.gov) • Private companies are creating web sites and providing public access to them. – A number of companies now specialize in making information available over the Internet. Slide 18 6 Data Data Sources Statistical Statistical Studies • Statistical studies can be classified as either experimental or observational. • In experimental studies • the variables of interest are first identified. • then one or more factors are controlled so that data can be obtained about how the factors influence the variables. • In observational (nonexperimental) studies • no attempt is made to control or influence the variables of interest. • a survey is perhaps the most common type of observational study. Slide 19 Data Acquisition Considerations Time Time Requirement • Searching for information can be time consuming. • Information might no longer be useful by the time it is available. Cost Cost of Acquisition • Organizations often charge for information even when it is no...
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