This site is a glossary of statistical terms:
http://www.stat.berkeley.edu/users/stark/SticiGui/Text/gloss.htm
This site gives an excellent interactive presentation of the normal distribution.
http://www.stat.wvu.edu/SRS/Modules/Normal/normal.html
Vassar provides an online linear correlation and regression calculator.
https://www.easycalculation.com/statistics/linear-correlation-coefficient.php
This site gives some links to articles related to correlation and regression:
http://www.dartmouth.edu/~chance/course/topics/correlation.html