________ is the bias that arises when actual respondents differ from those who refuse to participate in ways that affect the survey results

The essential objective of the drop-off survey is:

A) low cost because there is no mail-out expense. B) to gain a prospective respondent's cooperation. C) to minimize item omission bias. D) not to have to pay interviewers. E) to increase the speed of response.

The research industry's current standard telephone interview method is referred to as ________

A) standard telephone interviewing B) central location telephone interviewing C) methodological interviewing D) interview methodology E) telephone interview method