help needed on psychology.

help me answer this question the experiment consists of psychologist trying to find out how accurately students can solve multiplication problems. To do this the grgroups are divided in two ways: In the first is the type of reward, either a small reward or no reward, and the second is the amount practiced: either all by training in one three hour session or training in one hour per day for three days. They are trying to find out wether the types of reward and the days practiced affects how accurately students can solve the problems. What is the statistical test that you used to conduct this analysis?