I think I recently (few days ago, that is in the last few days of 2024) saw a Vsauce video/short about this regarding a trial trying to use the wisdom of the crowd to get an accurate number for the amount of jelly beans in a large jar. The trial was similarly skewed by "open" predictions, concretely people being allowed to give their predictions while in the presence of their group (friends/family/etc). Unfortunately I cannot seem to find it, but your comment reminded me of that.
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