This is an interesting concept. How do we as researchers trust any information as correct?
We don't accept any information at face value, written or verbal.
Always check all information with other sources look for other information to confirm or refute the original source of information.
Try to find three or more alternative sources.
Alternative sources means other types of sources not for instance other trees that contain the same information but compare census entries with birth and/or baptism information, electoral rolls, school rolls, burial registers, wills etc.
When looking at a source think -
Where did this information come from?
Is it likely to be accurate?
If so how accurate?
Can I access the original source of this information?
Take for instance an English census. If we disregard the 1911 census all earlier census are enumerators transcripts of returns and may contain errors in the copying process.
The Address is likely to be accurate
Names, Relationship and Condition is likely to be accurate but may include pet names and obsolete or terms where the meaning has changed.
The ages are likely to be inaccurate as age was not as important in the past as it is today and memory fails.
Occupation may use (now) uncommon terms and may only be a temporary occupation or false.
Place of Birth could easily be a wild guess.
Cheers
Guy