Perhaps, firstly, we need to define what is a POLL and what is a STUDY?
A Poll is a proportional minority representation of what the population think on a particular issue and is carried out by various groups in order to gauge public responses. A Poll uses a small cross-section of the population, and that cross section should include diversity in gender, culture, classes, professionals, ages. The responses to that Poll is then applied to represent, per capita of the population, some idea as to what Society may believe or perceive on a particular issue. Polls can be a tool to support proposals by governments or organisations to introduce changes by first gauging the mood of the people.
A Study is a constructed opinion, by professionals or oganisations who are either qualified in a particular field, or who have extensive experience in a particular industry or trade. Studies can be financed, either by governments or organisations, and used as a tool for introducing larger changes in Society either in laws, spending, investments on various, or structural changes which may have wide impacts on Society.
How much of any Poll or Study can be used in providing The Facts on any issue has to be taken, on a debating platform, in the context of a "guideline". And, unfortunately, these guidelines can be subjected to distortion, as we all know, by groups or industries seeking to promote their own interests.
Official sources are not easy to obtain on a variety of issues on Facts. Wikipedia does a pretty good job if one takes away political content which is sometimes injected into factual information which can really only be seen as a "perception". Media reporting is also guilty of introducing perceptions into factual information which can distort. Political parties are notoriously guilty of distorting facts on a wide range of issues. So Polls and Studies which one sees bandied around are not going to provide empirical proof on any issue, and should only be used, IMO, as a means to backing one's own personal perception and not rely heavily on what are really not facts at all, but carry opinions, assumptions and perceptions masquerading as Facts.
It really is an extremely difficult area as we Viners have numerous back and forths on what is factual information, and where and how do we obtain that in a world of propagandised influences. How more careful do we have to be in not only promoting those influences but also guard against subjecting ourselves to distortions on any reality?