**Hasty generalization** is an informal fallacy of faulty generalization by reaching an inductive generalization based on insufficient evidence—essentially making a rushed conclusion without considering all of the variables. In statistics, it may involve basing broad conclusions regarding the statistics of a survey from a small sample group that fails to sufficiently represent an entire population.^{[1]} Its opposite fallacy is called slothful induction, or denying a reasonable conclusion of an inductive argument (e.g. "it was just a coincidence").

Hasty generalization usually shows the pattern

- X is true for A.
- X is true for B.
- Therefore, X is true for C, D, E, etc.

For example, if a person travels through a town for the first time and sees 10 people, all of them children, they may erroneously conclude that there are no adult residents in the town.

Or: A person is looking at a number line. The number 1 is a square number; 3 is a prime number, 5 is a prime number, and 7 is a prime number; 9 is a square number; 11 is a prime number, and 13 is a prime number. Therefore, the person says, all odd numbers are either prime or square. In reality, 15 is a counterexample.

The fallacy is also known as:

- Illicit generalization
- Fallacy of insufficient sample
- Generalization from the particular
- Leaping to a conclusion
- Blanket statement
- Hasty induction
- Law of small numbers
- Unrepresentative sample
*Secundum quid*

When referring to a generalization made from a single example it has been called the fallacy of the lonely fact^{[2]} or the proof by example fallacy.^{[3]}

When evidence is intentionally excluded to bias the result, it is sometimes termed the fallacy of exclusion and is a form of selection bias.^{[4]}

- Accident (fallacy)
- Association fallacy
- Availability bias
- Blind men and an elephant
- Categorical imperative (redirected from "Generalization in ethics")
- Cherry picking (fallacy)
- Cognitive distortion
- Confirmation bias
- Converse accident
- Generalization (logic)
- Generalization error
- Hypercorrection
- Misleading vividness
- Pooh-pooh
- Problem of induction
- Slothful induction
- Statistical significance
- Stereotype
- Syllogism

**^**"Fallacy: Hasty Generalization (Nizkor Project)". Retrieved 2008-10-01.**^**Fischer, David Hackett (1970).*Historians' Fallacies: Toward a Logic of Historical Thought*. HarperCollins. pp. 109–110. ISBN 978-0-06-131545-9.**^**Marchant, Jamie. "Logical Fallacies". Archived from the original on 2012-06-30. Retrieved 2011-04-26.**^**"Unrepresentative Sample". Retrieved 2008-09-01.

- Common Logical Fallacies in Propaganda and Debate
- Fallacy: Hasty Generalization, Michael C. Labossiere's Fallacy Tutorial Pro
- Hasty Generalization, The Fallacy Files

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