What are the differences between correlational design, quasi-experimental design, and experimental design?
Correlational design simply investigates the relationship of one variable to another. Quasi-experimental and experimental studies test interventions, or independent variables (presumed causes) to see which most influences a dependent variable (or presumed effect). For example, a nurse might test whether one nursing intervention works better than another. The researcher is able to control a study in experimental design so that subjects can be randomly assigned to a treatment or control group. Researchers use quasi-experimental design when they are not able to randomize or control the subjects in a study.
