"after answering each question, the students would rate their own performance on each question as either “nailed it,” “not sure” or “no idea.” Well, there's th

"after answering each question, the students would rate their own performance on each question as either “nailed it,” “not sure” or “no idea.” Well, there's the bias. nailed-it vs no-idea isn't very binary. Try nailed-it and got-it-wrong and let's see what the stats show.