Randomize assignment to two simultaneous polls
This might be difficult but, for polls among registered participants only, could you allow randomization of which person gets which poll?
If the instructor could then show both activities simultaneously on screen, we could run randomized trials within the group.
An example of simultaneous assignment of two polls is:
but for that I had to do the polling outside of class. If we could do this live in class, we could develop more randomized experiments within the classroom.
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