Definition of response bias in US English:

response bias

noun

Psychology
  • A systematic tendency for respondents in a questionnaire, psychological test, etc., to give responses which do not reflect their true beliefs, typically because a question is phrased in a leading manner or because a given response is considered more socially acceptable; specifically a tendency to give a positive response; a bias in a voluntary survey caused by a greater likelihood of reply in people who give a particular response.

Origin

1940s.