Hasty generalization

From Exampleproblems

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" or "secundum quid", is the logical fallacy of reaching an inductive generalization based on too little evidence.

Examples with contradictions

"I loved the hit song, therefore I'll love the album it's on": Fallacious because the album might have one good song and lots of filler.
"This Web site looks OK to me on my computer; therefore, it will look OK on your computer, too": Fallacious because many computers present content differently.
"In my lifetime, there has been a leap year every fourth year; therefore, every fourth year, past, present, and future, is a leap year": Plainly untrue.

See also faulty generalization for other fallacies involving generalization.