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Non-experimental research  does not mean nonscientific.  non-experimental research  means there is a predictor variable or group of subjects that cannot be manipulated by the experimenter. typically, this means that other routes must be used to draw conclusions, such as correlation, survey or case  study.


experimental research this is an experiment where the researcher manipulates one variable, and control/randomizes the rest of the variables. it has a control group, the subjects have been randomly assigned between the groups, and the researcher only tests one effect at a time.