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In other words, the difference could easily be due to what statisticians call sampling error.

Let’s look a little more closely at these surprising results.

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.

Guilford was one of the first academic researchers who dared to conduct a study of creativity.

He challenged research subjects to connect all nine dots using just four straight lines without lifting their pencils from the page.

Today many people are familiar with this puzzle and its solution.

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

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