During every election in a particular region, pollsters conduct exit polls to help determine which candidate people voted for. During the most recent election, pollsters incorrectly predicted candidate A the winner over candidate B. When asked how this error could have happened, the pollsters cited interviewer error due to the fact that since many of the interviewers were young, only young voters selected in the sample agreed to be interviewed, and the interviewers made many mistakes when recording the responses of the respondents. In addition, the method of selecting individuals to be interviewed led to selecting a higher proportion of male voters, and candidate A was favored by males. Explain which nonsampling errors led to the incorrect conclusion regarding the election.