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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 the 1970s, however, very few were even aware of its existence, even though it had been around for almost a century.

If you have tried solving this puzzle, you can confirm that your first attempts usually involve sketching lines inside the imaginary square.

It's an interesting experiment, but the author's conclusion cannot possibly follow from the results of it.

Management consultants in the 1970s and 1980s even used this puzzle when making sales pitches to prospective clients.Although studying creativity is considered a legitimate scientific discipline nowadays, it is still a very young one. One of Guilford’s most famous studies was the nine-dot puzzle. Guilford was one of the first academic researchers who dared to conduct a study of creativity.The first group was given the same instructions as the participants in Guilford’s experiment.The second group was told that the solution required the lines to be drawn outside the imaginary box bordering the dot array.

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