Hasty Generalization is a logical fallacy in which a person draws a conclusion without providing sufficient data to support it.

Stan: My friend Dan was experiencing serious problems with a project similar to mine but he survived so I should also keep on trying with my project.

Mary: Your friend Dan's case is not representative of the whole population who had similar projects. He succeeded but it doesn't mean that all other people have succeeded. 

Full dialogue here: All argumentation fallacies

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