Crucially, the quizzes were presented as “honour tests” that participants would mark themselves, reporting their own scores to the study's organisers. The quiz papers were unnumbered and thus appeared to be untraceable, and were thrown away at the end of the study. In fact, though, each had one unique question on it, meaning that it could be identified—and the papers were recovered and marked again by the researchers after they had been discarded.
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