A general conclusion based on a very small sample.

A fallacy of reasoning by example that occurs when the examples selected to support the claim are either insufficient in number or in their representativeness. Improper appeal to practice A fallacious argument that occurs when a debater suggests doing something because it is a common practice, even if that practice clearly is wrong.

a fallacy of jumping to conclusions in which the conclusion is a generalization

a conclusion based on too few examples or examples which aren't typical or representative of a class. A type of fallacious argument.

Hasty generalization, also known as fallacy of insufficient statistics, fallacy of insufficient sample, fallacy of the lonely fact, leaping to a conclusion, hasty induction, law of small numbers, unrepresentative sample or secundum quid', is the logical fallacy of reaching an inductive generalization based on too little evidence. It commonly involves basing a broad conclusion upon the statistics of a survey of a small group that fails to sufficiently represent the whole population. Statistics in general can have many problems, especially in surveys where the questions can assume too much, be too vague, or be too misleading.