I went to a very large "white" university (40,000 students) and my 1st roommate was in a wglo. Anyway, the major thing that I can say about their graduation rate has alot to do with funds.
To be a member of the chapters on that particular campus was very very expensive...many of them had the money to pay dues and live in those Tara "Gone with the Wind" Houses--have really nice cars and shop til they drop and go to school and all without working...
It has been my experience that some of us become career students because we work to stay in school...
Just a thought