The hasty generalization fallacy is sometimes called the over-generalization fallacy. It is basically making a claim based on evidence that it just too small. Essentially, you can't make a claim and say that something is true if you have only an example or two as evidence.

What is an example of overgeneralization?

The American Psychological Association defines overgeneralization as, “a cognitive distortion in which an individual views a single event as an invariable rule, so that, for example, failure at accomplishing one task will predict an endless pattern of defeat in all tasks.” People with this condition take the outcome of ...

What is an overgeneralization fallacy examples?

So let's look at an example of overgeneralization here: “The whole world knows he's is a terrible teacher.” Here, our author is making an assumption that's pretty hard to be believed. Sure, it could well be that a lot of people indeed have a pretty negative view of that teacher.