Although they controlled for some aspects of students’ backgrounds, such as the education levels of their parents, it’s possible that other factors are responsible as well.
If you look at a students background, you can learn a lot about them. Their background shows how thrivers and divers are who they are. A person may come from low- income family and tries much harder to study to get into college, while a diver doesn't have to worry as much to get into college. Thrivers want to be intelligent and make a difference in the world to make their parents proud, while divers want to be successful and rich like their parents.