In a study using a true experimental design, which of these methods would control for antecedent variables?
a. Manipulation of the independent variable
b. After-only data collection
c. Intervention fidelity
d. Random assignment to groups
ANS: D
Feedback
A Manipulation of the independent variable cannot control a factor that occurred before the study.
B After-only data collection would not control preexisting variables.
C Systematically delivering the intervention would not control preexisting variables.
D Random assignment to groups helps ensure that antecedent (preexisting) variables will be similarly distributed between groups.
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