Only 21% were correct on their first attempt, and 28% never discovered the rule at all. To which hypothesis-testing task, devised by Wason (1960), do these findings refer?

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The findings refer to the 2-4-6 task, a hypothesis-testing task devised by Peter Wason in 1960, where participants must determine a rule that applies to triples of numbers through generating examples and receiving feedback.

Only 21% Were Correct on Their First Attempt, and 28