A sociologist is collecting data on the age at which students graduate from high school and the age at which students graduate from college. The ages of students graduating from high school tend to be around the same, 17-20 years old is typical. The ages of students that graduate from college tend to be more diverse, because there are traditional students, those that graduate from high school and go straight to college, and non-traditional students, those that return to college for a variety of reasons.