Experimental research: Experimental Research Design is a scientific approach to research, where one or more independent variables are manipulated and applied to one or more dependent variables to measure their effect on the latter. The effect of the independent variables on the dependent variables is usually observed and recorded over some time, to aid researchers to draw a reasonable conclusion regarding the relationship between these two variable types (Blog, 2021). An example of experimental research is a test to know the effect of a new drug intended to treat a certain medical condition like dementia. If a sample of a dementia patient is randomly divided into three groups, with the first group receiving a high dosage of the drug, the second receiving a low dose and the third group receive a placebo such as a sugar pill, then the first two groups are experimental groups and the third is a control group. After administering the drug for a while, if the condition of the experimental group subjects improved significantly more than the control group subjects, we can say that the drug is effective. We can also compare the conditions of the high and low dosage experimental groups to determine if the high dose is more effective than the low dose.
Non-experimental research: Non-experimental research is the type of research that does not involve the manipulation of control or independent variable. In non-experimental research, researchers measure variables as they naturally occur without any further manipulation. Correlational is classified as non-experimental because it does not manipulate the dependent variables. For example, if a researcher may wish to investigate the relationship between the class of family students come from and their grade in school. A questionnaire may be given to students to know the average income of their family, then compare it with CGPAs (Blog, 2021). The researcher will discover whether these two factors are positively correlated, negatively corrected, or have zero correlation at the end of the research.
Controlled allows the experimenter to minimize the effect of factors other than the one being tested. It’s how to know an experiment is testing the things it claims to be testing (Crotty, 2018). In experimental research, researchers can control and manipulate control variables, while in non-experimental research, researchers cannot manipulate these variables (Blog, 2021).
Provide examples of experimental and nonexperimental research design. Contrast the levels of control applied to each.