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Data Collection -- Sampling and Survey Issues -- Probability and Sampling

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View Resource ** Sampling Distribution of the Mean Tutorial

This tutorial demonstrates the properties of sampling distributions using a Java applet. The tutorial has an accompanying hand-out that you can download.

http://wise.cgu.edu/sdmmod/
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 Cartoon: Entering Chicago

A cartoon to teach the idea that sampling variability depends on the size of the sample, and not on the size of the population (as long as the sample is a small part of the population). Cartoon drawn by British cartoonist John Landers based on an idea from Dennis Pearl. Free to use in the classroom and for course websites.

http://www.causeweb.org/resources/fun/db.php?id=292
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 HotBits

HotBits is a genuine random number generator powered by radioactive decay. Simply click the "Request HotBits" link, and specify how many bytes you would like (up to 2048) and in what form you prefer them. Hexadecimal returns numbers and letters, while C language returns integers. Then click the "Get HotBits" button, and your random numbers will appear on the screen.

http://www.fourmilab.ch/hotbits/
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