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Most people assume that 60 percent to 90 percent of the group given the clue would solve the puzzle easily. What’s more, in statistical terms, this 5 percent improvement over the subjects of Guilford’s original study is insignificant.
In other words, the difference could easily be due to what statisticians call sampling error.
In other words, the “trick” was revealed in advance.
Solving this problem requires people to literally think outside the box.It was an appealing and apparently convincing message.