SEO really important? Are there any studies? [closed]

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I'm studying at a university, and it's really important to be able to support arguments with facts. Are there any studies about SEO? I've read that people don't bother to go to the next page on google, they do a new search instead. But are there really any studies in the subject?

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But are there really any studies in the subject?

For example, the pie chart on this page says that 40% of clicks are on the top (number 1) search result, that 90% are on the first page, and that 0.01% are on neither pages 1 and 2.