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Sources and evidence

False precision

An exact figure (“37% more”) with no checkable source – it sounds credible but proves nothing.

A figure with a decimal point looks as if someone measured it carefully. Without a source, a method and the number of people studied, it is no more checkable than a guess.

Example · made up for illustration
A post says: “People who go to bed before ten are 42.6% happier.” Who measured it, on how many people, and how anyone can measure happiness to a tenth of a percent, you never find out.

How to spot it

  • A very precise figure for something that can't be measured precisely (happiness, intelligence, satisfaction).
  • No information on who found the figure, when, or how many people were studied.
  • The figure is repeated from article to article, but the original source is nowhere to be found.
  • An AI answer gives exact percentages without a link.

How to check and what to do

  • Ask: where does the figure come from, who measured it and how?
  • Look for the figure in the original study or statistics, for example on your national statistics office's website.
  • If you can't find the source, treat the figure as unverified and don't pass it on.

The card fits on one A4 page – for the classroom, a noticeboard, or parents and grandparents.

Practise it

Lessons and articles where you hunt for this trick with the red pencil.

More tricks from the chapter Sources and evidence.

All tricks in the atlas →

False precision: how to spot and check it | ThinkCritical.eu