define pre experimental design
Pre-Experimental Design. Pre-experimental design is a research format in which some basic experimental attributes are used while some are not. This factor causes an experiment to not qualify as truly experimental.
Experimental and quasi-experimental research designs. Ph.D. In an experimental design, subjects are randomly assigned to groups for different levels of treatment (or no treatment, i.e., the control group). In a quasi-experimental design, subjects are not randomly assigned to treatment; there is no randomization. Random assignments of subjects helps control for participant differences, one of the main sources of threats to internal validity of a research study.