Sure too soon

Confidence often rises faster than knowledge. A topic you have just met can feel clear, while a specialist hedges, and a later test shows the gap. A small sample does the same work for a product: seventy percent of ten people is a story about ten people. Overconfidence here is not a personality type. It is a mismatch between how sure you feel and how much you have seen. Ask what would change the percentage, and how many cases are underneath it.

Cognitive bias

Overconfidence

Overconfidence is certainty that outruns the evidence, common when someone has just met a subject and cannot yet see its difficulties. Specialists often hedge because they can see the ways a claim fails. High confidence is not high competence.

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Mini check

You feel very confident about a topic you have only just met, while a specialist hedges. A later test shows you knew little. Which pattern is the closest description?

Certainty rose faster than the knowledge that was behind it.The specialist is attacking a weaker claim than you made.The specialist's hedge is misread as ignorance of the new topic.Belief is already matched to the evidence you actually have.

An advert says "70% of users prefer our app". The small print says 10 people were asked. What should you notice?

Seven people out of ten is far too few to say much about users in general.70% is a large share, so the sample size does not matter.A percentage is only valid if 100 people were asked.The claim must be false, because adverts cannot use surveys.

Try it today

Before you repeat a sure claim, write how many cases it actually rests on.

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