_____ is a fallacy that affects inductive generalization. The fallacy occurs when there is a reasonable likelihood that the sample [that is to be used as evidence] is not representative of the group. Such likelihood may arise if the same is either too small or not randomly selected.

e.g. "The mass shooting in a Colorado movie theatre was carried out by a young, while male. The school shootings in Roseburg, Santabarara, and Newton were all carried out by young white males. The evidence is clear. Young, white males are a serious threat to public safety."