Found at Vermont Schools Rock……
View data from a Nebraska study about curriculum offerings and student participation rates in high schools of various sizes
Course offerings generally go up as school size increases, as does total participation (enrollment units). However, enrollment units per student decline; students do less when offered more.
The smaller the school, the more kids are doing in both academic and non-academic classes. Not presented here is a finding that study hall participation rate increased as school size increased.
This is consistent with the idea that curriculum enrichment enriches a few but not most students. Many students may do less in a big school because their lack of participation is not noticed and perhaps, if they are not good test takers, unwanted.