30-month study of 26,811 students finds AI homework use cuts time from 64 to 45 minutes, scores up 18%
lmoroney · x · 2026-10-24
A new CEPR study by David Strömberg, Victor Lei, and Yanhui Wu tracked 26,811 students in grades 7-12 in a central Chinese county for 30 months.
Key findings:
- Within six months of starting to use AI for homework, completion time dropped from 64 to 45 minutes
- Homework scores rose 18%
- The study also examined changes in other learning outcomes over the same period (thread truncated)
One of the few large-sample, long-duration empirical studies on whether AI helps or hurts learning — directly relevant to the ongoing debate about AI's impact on education.
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