Sometimes It Is Difficult If Not Impossible to Find a Control

Multiple Choice

Sometimes it is difficult if not impossible to find a control group that is sufficiently comparable to an experimental group to allow for a traditional two-group experimental design. In these cases, one may want to use a time-series design

A) which is a quasi-experimental design involving multiple measures of the dependent variable on a single group, both before and after treatment.
B) which is a strong experimental design involving multiple measures of the dependent variable on a single group, both before and after treatment.
C) which is an experimental design using multiple dependent measures on the experimental group, then taking measures on control participants over time, as he or she can find them.
D) staggers the time of presentation of the independent variable across participants.