2RA3 (the pre-req) covered basic stuff like Z-tests, T-tests, standard deviations, powers of certainty stuff like that.
2RB3 covered regressions, Chi squares, ANOVAs, and non parametrics (Kruskal-wallis, friedman's test, etc). Neither is that difficult, I just found that the second semester stuff was more practical and easier to relate to real life.
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