The advantages of mail surveys include not only the elimination of a field staff,but simpler monitoring of interviewer bias,because the supervisor can be present at the time the mailings are developed.

Question

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Mail surveys eliminate the need for a field staff and reduce interviewer bias since there is no direct interaction between interviewers and respondents, but supervisors cannot monitor interviewer bias at the time of mailing as there are no interviewers involved.

The Advantages of Mail Surveys Include Not Only the Elimination