1. Great Academic presentation about T Test and Anova :
https://sites.google.com/site/statigil/
2. Anova from Wikipedia:
https://en.wikipedia.org/wiki/Analysis_of_variance
3. T Test from Wikipedia:
https://en.wikipedia.org/wiki/Student’s_t-test
4. Chi Square:
http://www.tau.ac.il/~ricardo/mekuvan/2004_5/presentations_2005_b/class_b_5.ppt