Can you do a bigger sample size - say 10 years? 3 and 4 are too small. Also - I think there’s a Covid effect - many students switched to privates beginning 2020.
Here you go:
in last 10 years of play including this fall:
Girls volleyball class 3A & 4A (biggest classes) 40 possible finalists. 27 of them were private schools
Girls basketball class 3A & 4A (biggest classes) 40 possible finalists. 13 of them were private schools.
Girls softball class 3A & 4A (biggest classes) 40 possible finalists. 9 were private schools.
Boys basketball class 3A & 4A (biggest classes) 40 possible finalists. 10 were private schools.
Boys baseball class 3A & 4A (biggest classes) 40 possible finalists. 16 were private schools.
Girls soccer all 3 classes. 60 possible finalists. 22 were private schools.
Boys soccer all 3 classes. 60 possible finalists. 28 were private schools (the 28 does not include Chicago's Solario Academy. I don't know if that's public or private).