help needed on psychology.

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?