Which logical fallacy describes an argument formed from a single instance without sufficient evidence?

The logical fallacy that describes an argument formed from a single instance without sufficient evidence is properly identified as hasty generalization. This fallacy occurs when a conclusion is drawn based on an insufficient sample size, leading to a broad claim that may not be supported by adequate evidence.

For instance, if someone observes one instance of a particular behavior in a group and then claims that all members of that group behave in the same way, they are committing a hasty generalization because they are extrapolating from a single case without accounting for variations in the larger population.

In this context, choices that might be incorrectly associated with the question include selected instances, which refers to cherry-picking data or examples to support a claim, or composition, which involves assuming what is true for a part is true for the whole. Concurrency does not pertain to making generalized arguments based on limited data. Recognizing these nuances is important for understanding the fallacies in reasoning and constructing valid arguments.