Well, in USA, I have to show that I can pay the tuition fee and also support myself. If I receive tuition waiver,I need not pay tuition fee, but I have to support myself. If I receive a TAship offer, then I can show that and say that I have my means to support myself in USA. The TAship amount is enough for the living expenses in the United States.
When I face the visa interview, will I have to bring bank statement to show some amount of money? How much? My economic condition is not good.