A political scientist at the University of Chicago studied the effect of the race of the interviewer.7 Following a phone interview, respondents were asked whether they thought the interviewer was black or white (all were actually black). Perceiving a white interviewer resulted in more conservative opinions. For example, 14% agreed that “American society is fair to everyone” when they thought the interviewer was black, but 31% agreed to this statement when posed by an interviewer that the respondent thought was white. Which type of bias does this illustrate: Sampling bias, non response bias, or response bias? Explain.