You are conducting a piece of research looking at prejudice . Whilst participants are given a questionnaire to complete that measures their prejudice, it is not obvious from the questions that this is the case. Furthermore, participants are not told that the research is about prejudice because it is felt that this could alter their responses. After all, few people would be happy if other people thought they were prejudice. As a result, if participants knew that this is the purpose of the study, they may well provide responses that they think will make them appear less prejudice.