Experimental and Quasi-Experimental Research Designs Essay

The experimental research design is one of the most dependable quantitative designs available. Basically. it requires that the research worker behavior an existent experiment in order to turn out the research hypothesis. Similar yet basically different from the experimental design is the quasi-experimental design. his paper discusses the process in carry oning an experimental design research and differentiates it from a quasi-experimental research design. Examples of each are given to ease farther comparing and contrast. The first measure in carry oning an experimental research design is to place the independent and dependent variables.

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Harmonizing to Random House’s lexicon of statistical nomenclatures. “the dependant variable is the event studied and expected to alter when the independent variable is changed. ” ( Random House. 2001. p. 534 ) . In Butler and Lijinsky ( 2005 ) which is an illustration of experimental research. the independent variable was the type of rat while the dependant variable was the toxicity degree. This meant that the research seeks to verify whether different types of rats would hold different acute toxicity degrees. After the designation of the independent and dependent variables. the following measure is to randomly choose a sample for the experiment.

To randomly choose a sample means to do certain that all of the members of the population have an equal opportunity of being selected ( Corder & A ; Foreman. 2009 ) . For illustration. when seeking to analyze a school population as is the instance in of Stevens & A ; Slavin ( 1995 ) . random sampling is conducted by puting all of the possible respondents in a list and choosing from that list indiscriminately. In this manner. each pupil has an equal chance to be selected for the survey. Lastly. one time the experiment is conducted. a secure ambiance is generated wherein the consequence of other factors are minimized ( Mertens. 1998 ) .

Traveling back to Butler and Lijinsky ( 1995 ) . the experiment was conducted in a secure atmosphere where the lone variables were the type of rat and the toxins induced to them. All other factors such as the nutrient they were given. the infinite of their coops and so on were kept the same for the different types of rat. In a quasi-experimental attack. an experiment is besides conducted and dependent and independent variables are besides selected. Measures to maintain all other variables invariables are besides taken. However. the specifying difference between the tow is that quasi-experimental designs do non carry on random trying ( Mertens. 1998 ) .

For illustration. the quasi-experimental research conducted by Dutton ( 1986 ) merely a sample from those that were available. This is non random sampling and hence the design can non be considered as experimental but it does suit the quasi-experimental description. In decision. it is clear that while experimental and quasi-experimental research designs are similar. they do hold an indispensable difference.


Butler. A. and Lijinsky. W. ( 2005 ) . “Acute toxicity of aflatoxin G1 to the rat” Journal of Pathology. 102 ( 4 ) . 209-212. Corder. G. . Foreman. G. ( 2009 ) . Nonparametric Statistics for Non-Statisticians: A Bit-by-bit Approach. Wiley. Dutton. D. ( 1986 ) . “The Outcome of Court-Mandated Treatment for Wife Assault: A Quasi-Experimental Evaluation. ” Violence and Victims. 1 ( 3 ) 163-175 Mertens. D. ( 1998 ) . Research methods in instruction and psychological science: Integrating diverseness with quantitative & A ; qualitative. Sage. Random House. ( 2001 ) . Random House Webster’s Unabridged Dictionary. Random House. Inc. Stevens. R. . and Slavin. R. ( 1995 ) . Effectss of a Cooperative Learning Approach in Reading and Writing on Academically Handicapped and Nonhandicapped Students. The University of Chicago Press.


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