A} How are variables operationalized?
B} Which variable-independent, dependent, or confounding-is the focus of the research study?
C} What key techniques separate experimental from nonexperimental research designs?
D} What research design would best compare two patient interventions (e.g., for lowering cholesterol)?
E} Why might a practitioner use a quasi-experimental research design in the practice setting?
F} How does a systematic review differ from a meta-analysis?