In this applet, A and B are subsets of a universal set S. The list is given of the 16 different subsets of S that can be constructed from A and B using the basic set operations of union, intersection, and complement....
This tutorial, by David Polson of Athabasca University, introduces 9 sources of threat to internal validity in Part 1 and asks the user to classify hypothetical experiments as either internally valid or invalid and...
This introductory statistics introduction, by StatSoft, gives an overview of variables, classifications, measurements, relations, and other basic statistical concepts. There are also two animated graphs illustrating...
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