Columbia University
University of Michigan: Generalizing From Sample to Population [Pdf]
This is a slideshow presentation that offers many examples of statistical studies where generalizations to the larger population were made, often leading to incorrect assumptions. While the author's commentary has been omitted, there are...
Other
University at Albany: Populations and Samples: The Principle of Generalization
This resource explains what generalization is in statistics, its advantages and disadvantages, and problems that can occur, e.g., sample or response bias. Includes detailed examples of sampling error and sample bias.