Welcome, @stephane-maarek

It’s indeed an intriguing area of research. 🙂 As a like-minded fellow mentor, I had similar research questions in mind. I knew I could not study it myself because I had no access to enough data. I brought them up on one of the suggestion threads here in the community.

Is this a correlational study? Are you studying it in just one course? I think subject and assignment types in each course should also be taken into account.