A server expects a group of poorly dressed customers to be stingy tippers and gives them poor service,so he gets the result that he expects,a very small tip.This is an example of

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This is an example of a self-fulfilling prophecy, where the server's expectations lead to their behavior, which in turn leads to the expected outcome. The other options do not fit this scenario as well - the halo effect refers to a generalization based on one trait, selective perception error is when we only notice information that confirms our preconceptions, fundamental attribution bias relates to judging others' behavior as being caused by their personality rather than external factors, and self-serving bias is when we attribute positive outcomes to our own abilities and negative outcomes to external factors.

A Server Expects a Group of Poorly Dressed Customers to Be