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Hyperstat Online Statistics Textbook:
There are many places in the world
were people try to support their teaching of statistics
by means of interactive text pages and computer
programs. This site by David M. Lane has a lot of nice
stuff. A nice extra of this site is that it contains
numerous links to still other places on the web with
material on statistics. A minus point are the many adds
(although they are from companies offering statistics
related stuff).
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Research Methods Knowledge Base: The Research
Methods Knowledge Base is a comprehensive web-based
textbook that addresses all of the topics in a typical
introductory undergraduate or graduate course in social
research methods.
It also addresses the major theoretical and
philosophical underpinnings of research including: the
idea of validity in research, reliability of measures
and ethics.
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Statsoft
Electronic Textbook: Statsoft is one of the
competitors of SPSS as developer of statistical
software. Their free online Statistics Textbook offers
training in the understanding and application of
statistics.
The American
Statistical Association has a large website with
lots of interesting materials (if you know where to find
it). For example have a look at the paper "What
is a survey" (pdf, 1040 KB) published by the survey
research method section of the ASA.
Helpdesk IBM SPSS Statistics 20