Experimental design employs comparison as its strategy for the given research. It uses two groups, which the researcher uses for comparison purposes. These include the experimental group and a control group. The two groups used in a study have similarities, but the experimental group uses the independent variable, whereas the researcher the control group is not assignment of subjects to either control or experimental group because it is central to chance. Nevertheless, the researcher assigns cases to the two groups randomly. In order to determine the influence of the independent variable, investigators will measure the dependent variable, designated as scores, two times from both groups (Frankfort-Nachmias and Nachmias, 2008).

In addition, researchers take a single measurement, the pretest, for all cases before introducing the independent variable in the experimental group. Moreover, they also take a second measurement, the posttest, for both cases after exposing the experimental group to the independent...
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