Reinforcement learning tutor better supported lower performers in a math task. - Ruan, Sherry; Nie, Allen; Steenbergen, William; He, Jiayu; Zhang, J. Q.; Guo, Meng; Liu, Yao; Dang Nguyen, Kyle; Wang, Catherine Y.; Ying, Rui; Landay, James A.; Brunskill, Emma (Machine Learning, 2024)