I gave my students a take home exam over spring break. (This is normal where I teach) One of the questions was particulary difficult. It came down to a factor of three in the solution. That factor inexplicably appeared with no justification on many of their exams. I intend to have the students I suspect of cheating come to my office to solve the problem on the board. What would you do?
Edit: I gave them the Tuesday before spring break until the Thursday after. I didn’t want it to be right before or right after.
When I say normal I mean giving take home exams.
I’ve seen various ways to handle it. My favorite is to grade the rest of the exam extremely harshly, where even a minor mistake could get full points taken off. Unfortunately, it’s extremely difficult to prove cheating. I’ve had students copy word-for-word from Google and that still wasn’t enough evidence. I don’t think even having the students solve it in the board could convince the higher ups to do anything