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The correct solution, however, requires you to draw lines that extend beyond the area defined by the dots.
That is, direct and explicit instructions to think outside the box did not help.
In other words, the “trick” was revealed in advance.
Would you like to guess the percentage of the participants in the second group who solved the puzzle correctly?
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.