During a research project, interviewers are giving a quota of interviews to complete within a

given time frame. One interviewer consistently exceeds the quota but her data reveals lots of out-

of-range responses to questions. What interviewer error should be of concern? falsification of

interview or question answers. Supervision of interviewers, whether surveys by personal

interview or phone, is a necessary task in survey research. You'll learn more about this in data

preparation

a Failure to consistently execute interview procedures

b Failure to record answers accurately or completely

c Physical presence bias

d Falsification of interview or question answers.

e Failure to secure participant cooperation