Question

Tell me how I can tell what is fallacies and bias? In a Thesis

Answer 1

This is one of the best webpages I've found about fallacies -- and how to avoid them!
http://www.unc.edu/depts/wcweb/handouts/fallacies.html

Be sure to look at the right, too, for a list (and examples) of the most common fallacies.

Let us know if you have further questions.

Answer 2

Fallacies are often used to "prove" a bias. Below is a definition of bias and a site which explains fallacies.

Definition from Merriam Webster:
3 a: bent , tendency b: an inclination of temperament or outlook ; especially : a personal and sometimes unreasoned judgment : prejudice c: an instance of such prejudice d (1): deviation of the expected value of a statistical estimate from the quantity it estimates (2): systematic error introduced into sampling or testing by selecting or encouraging one outcome or answer over others

http://www.nizkor.org/features/fallacies/