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Quasi Experimental Design: Pre-Post Test Without Control Group and With Control Group
Transcript of Quasi Experimental Design: Pre-Post Test Without Control Group and With Control Group
Provides another way to test change (baseline)
Gives more subjects to bases data/conclusions How it Works: Weaknesses Requires more subjects (tedious and time consuming)
Control groups may have oddities that affect the data
Something in the test may make group incomparable Strengths Pretest acts as a control group
Compares the same people to themselves
Have more control over the variables
Better for testing rare scenarios when subjects are rare Weaknesses Human error
The pretest subjects may have been outliers anyway
Less subjects to collect data on Target Population Selection Pretest Intervention X Business as usual Posttest Target Population Selection Pretest Intervention X Posttest Quasi-Experimental Design:
Used when it is unethical or impractical to conduct on a whole population
Total control over the experiment is lacking
Variables such as timing, selection of subjects, and ability to randomize are not controlled. How it Works: Work Cited "Quasi-Experimental Design." Quasi-Experimental Design. N.p., n.d. Web. 14 Oct. 2012. <http://www.socialresearchmethods.net/kb/quasiexp.php>.
"Quasi-Experimental Study." Quasi-Experimental Study. N.p., n.d. Web. 14 Oct. 2012. <http://www.nationaltechcenter.org/index.php/products/at-research-matters/quasi-experimental-study/>.
"Writing Guides." Writing Guides. N.p., n.d. Web. 14 Oct. 2012. <http://writing.colostate.edu/guides/page.cfm?pageid=1368>. Threats to Internal Validity:
Bias with Selection
Diffusion (control group and treatment group being too alike)