Interpreting the data that way assumes everyone is equal, which I think most would agree is not true in the real world. There are a lot of factors that prevent

Interpreting the data that way assumes everyone is equal, which I think most would agree is not true in the real world. There are a lot of factors that prevent people from graduating, or even attending in the first place, that also seem related to what employers look for in the work place (determination, natural ability, etc). What does the data look like if you limit the set exclusively to those who are fully capable of graduating from college?