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

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.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?It was an appealing and apparently convincing message.Indeed, the concept enjoyed such strong popularity and intuitive appeal that no one bothered to check the facts.Let’s look a little more closely at these surprising results.Solving this problem requires people to literally think outside the box.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.

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