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Video: Against All Odds: 17. Samples and Surveys

This free online video program "shows how to improve the accuracy of a survey by using stratified random sampling and how to avoid sampling errors such as bias. While surveys are becoming increasingly important tools in shaping public policy, a 1936 Gallup poll provides a striking illustration of the perils of undercoverage."
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Author Name: 
Annenberg/CBP
Technical Requirements: 
Windows media player, broadband connection, Java script enabled
Source Code Available: 
Source Code Available
Intended User Role: 
Learner, Teacher
Resource Type: 
Copyrights: 
Yes
Cost: 
Free for All
Format: 
Math Level: 

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