Final answer:
Ann is using consensus to make her judgment about the stranger's behavior, perceiving it as situational since she has seen similar reactions in comparable circumstances.
Step-by-step explanation:
Ann is using the concept of distinctiveness to make her judgment.
Distinctiveness refers to the extent to which a person's behavior varies across different situations. In this case, Ann is observing that both the stranger and her sister responded with yelling in similar situations, suggesting that the behavior is more situational rather than a reflection of their usual behavior.
By considering the distinctiveness of the behavior, Ann is able to make a judgment about the stranger's behavior.