Factors other than the survey by itself can influence responses.For example,the gender or ethnicity of an interviewer may influence participants.These factors are known as

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Extraneous factors are outside factors that can affect responses and need to be controlled for in research. In this case, the gender or ethnicity of the interviewer are examples of extraneous factors that can influence survey responses. Reliability factors and validity re-test factors are aspects of measurement and data analysis, while internal factors usually refer to psychological processes within a person. Thus, C) extraneous factors is the best choice for this question.

Factors Other Than the Survey by Itself Can Influence Responses