Links

Videos

Cumulative Frequency Distributions  (time: 9:10)
http://www.youtube.com/watch?v=8zVrqfTsgss

This video tells how to read a z-score table
http://www.youtube.com/watch?v=_cVhKkhydm4

History

This is one of the best all around sites that I have found. It is titled "The MacTutor History of Mathematics Archive."
http://www-history.mcs.st-and.ac.uk/~history/

This is an award-winning site that links to all sorts of mathematics information.
http://archives.math.utk.edu/

Reference Topics

This site is a glossary of statistical terms:
http://www.stat.berkeley.edu/users/stark/SticiGui/Text/gloss.htm

This excellent site presents a complete overview of measures of dispersion.
http://www.quickmba.com/stats/dispersion/

This site illustrates a normal distribution arrived at experimentally.
http://davidmlane.com/hyperstat/z_table.html