Statistics Useful Links
Statistics Glossary - hypothesis testing
http://www.stats.gla.ac.uk/steps/glossary/hypothesis_testing.html#h0
Common Concepts in Statistics
http://dorakmt.tripod.com/mtd/glosstat.html
The Research Sample, Part II: Sample Size
http://www.oandp.org/jpo/library/1995_04_137.asp
Electronic Statistics Textbook
http://www.statsoft.com/textbook/stathome.html
Random numbers
http://www.graphpad.com/quickcalcs/RandMenu.cfm
Catagorical data
http://www.graphpad.com/quickcalcs/CatMenu.cfm
Continuous data
http://www.graphpad.com/quickcalcs/ContMenu.cfm
Statistical distributions and interpreting P values
http://www.graphpad.com/quickcalcs/DistMenu.cfm
Linear interpolation
http://www.ajdesigner.com/phpinterpolation/linear_interpolation_equation.php
American Statistical Association (ASA): there are many useful links to various organizations and topics here
http://www.amstat.org/index.cfm?fuseaction=main
The International Biometric Society
http://www.biometrics.tibs.org/
Drug Information Association
http://www.diahome.org/docs/index.cfm
International; Statistical Institute
http://isi.cbs.nl/