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Searched for: Statistical Topic is Data Collection -- Sampling and Survey Issues -- Probability and Sampling
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View Resource Cartoon: Falling Asleep

A cartoon to teach about the value of random sampling to control bias and provide the underpinning for inference. Cartoon by John Landers (www.landers.co.uk) based on an idea from Dennis Pearl (The Ohio State University). Free to use in the classroom and on course web sites.

http://www.causeweb.org/resources/fun/db.php?id=3
View Resource Against All Odds: 14. 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." This individual video is accessed by scrolling down to the "Individual...

http://www.learner.org/resources/series65.html
View Resource Myth and Reality in Reporting Sampling Error

This article gives a description of typical sources of error in public opinion polls. It gives a short but insightful explanation of what the margin of error indicates as well as other common errors in opinion polls.

http://www.pollingreport.com/sampling.htm
View Resource M and M Applet

Students can sample numerous bags of M&Ms. A plot of the relative frequency of each color is continually updated above the sampling frame. Each sample bag of M&Ms contains 56 candies.

http://www.stat.tamu.edu/~west/applets/mandmtest.html
View Resource Probability Sampling

This site describes in detail 5 different types of random sampling, giving examples, definitions, and procedures.

http://www.socialresearchmethods.net/kb/sampprob.htm
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