SEO Ranking Factors 2014 Study

How do they know the bounce rate and time on site? For that second graphic they claim they gathered 300,000 urls for 10,000 keywords. Do they have analytics on those sites or what?
 
It is possible to develop an app that once authorized is able to access a particular user's Google Analytics data. They most likely sent a request to participate in their survey and share their GA data.
 
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