OpenIntroOrg Observational Studies and Sampling Strategies

This video was created by OpenIntro ( http://www.openintro.org) and provides an overview of the content in Section 1.4 of OpenIntro Statistics ( http://www.openintro.org/stat), which is a free statistics textbook with a $10 paperback option on Amazon.

Generally, data in observational studies are collected only by monitoring what occurs, while experiments require the primary explanatory variable in a study be assigned for each subject by the researchers.

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Observational Studies and Sampling Strategies
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