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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.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 second group was told that the solution required the lines to be drawn outside the imaginary box bordering the dot array.
It was an appealing and apparently convincing message.