Is it likely that different data collection methods (i.e., phone interviews, in-person self-report questionnaires, survey mailings, etc) will yield different response rates?

DQ’S

1 dq 1

Is it likely that different data collection methods (i.e., phone interviews, in-person self-report questionnaires, survey mailings, etc) will yield different response rates? That is, are people more likely to respond or provide data using one approach relative to the others? Why or why not? Similarly, might the quality or accuracy of the provided data differ across the approaches? Why or why not?

1dq 2

Does all data have a mean, median, or mode? Why or why not?