Google SEO polls
This page collects polls made to webmasters
Does Google crawl No Follow Links, despite their official statements?
What is your experience?
Quick poll: did you mark your links as UGC or SPONSORED already? (Oct 2019)
As a marketer you probably understand statistics and it's problems well. Here, as as the mediums like Twitter or interest groups and list allow, all these polls were conducted in public with an unknown number of participants in variable time periods, so unknown N, as most market research.
Just be aware that there's any bias in there, like with most market research.