Hasty Generalisation and Anecdotal Evidence

Two of the most common reasoning errors in everyday life — and in LNAT passages — involve drawing broad conclusions from insufficient evidence. A hasty generalisation reaches a sweeping conclusion from too few cases or an unrepresentative sample, whilst anecdotal evidence treats individual stories or personal experiences as proof of general claims. Recognising these fallacies is vital because LNAT questions frequently ask you to evaluate the strength of evidence and identify where conclusions go beyond what the data supports.

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Hasty Generalisation

A hasty generalisation is committed when a conclusion about a whole group, population, or phenomenon is drawn from a sample that is too small or unrepresentative to support it.

Structure

Component	Description
Limited evidence	A small number of cases or an unrepresentative sample
Broad conclusion	A general claim about a whole group or category
The flaw	The evidence does not justify the scope of the conclusion

Example

"I visited two comprehensive schools last week and both had poor discipline. Comprehensive schools clearly have a discipline problem."