After seeing your new neighbor walking very stiffly and primly by your house wearing horn-rimmed glasses on a chain, a cardigan sweater, and her hair in a bun, you decide she must be a librarian. your judgment is based on

The judgment that you have provided in the scenario of your neighbor being a librarian just because of some little evidences means that it is based on representativeness heuristic. This is a type of judgment in which is uncertain and are only made just because of a certain event that has occurred or has been provided.