Before you look for your datasets, you might want to check out this website.
Electronic Statistics Textbook. StatSoft, Inc. (2013). Tulsa, OK: StatSoft. "The Electronic Statistics Textbook begins with an overview of the relevant elementary (pivotal) concepts and continues with a more in depth exploration of specific areas of statistics, organized by "modules" and accessible by buttons, representing classes of analytic techniques. A glossary of statistical terms and a list of references for further study are included."
From Sheridan Libraries at Johns Hopkins University. A great place to start when looking for datasets. Clear description of sources with categoreis for demographics, economics, education, health and ICPSR. Another great tool by a librarian: Jen Darragh
From the National Institutes of Health/National Library of Medicine. Includes some of the major sources of health and general statistics in the United States and a brief list of international resources. This subject guide is not meant to be comprehensive but to serve as a pointer to major information sources.