3. What key characteristic distinguishes true experimental designs from pre experimental designs? TRUE-EXPERIMENTAL DESIGNS must employ the following: Random selection of subjects Use of control groups
Mini Task 10 Thursday (8:00 pm – 9:00 pm) Leung Gar Ming 21758972 MKF 2121 Random assignments to control and experimental groups Random assignment of groups to control and experimental conditions In order for an experiment to follow a true-experimental design, it must meet the preceding criteria. There is some variation in true-experimental designs, but that variation comes in the time(s) that the treatment is given to the experimental group, or in the observation or measurement (pre-test, post-test, mid-test) area. Advantages: greater internal validity and causal claims can be investigated. Disadvantages: less external validity and not very practical. NON-EXPERIMENTAL DESIGNS are lacking in several areas of the true-experimental criteria. Not only do they lack random selection in most cases, but they usually just employ a single group. This group receives the "treatment," there is no control group. Pilot studies, one-shot case studies, and most research using only one group, fall into this category. Advantages: very practical and set the stage for further research Disadvantages: lower validity
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- Fall '16
- researcher, Causality, LEUNG GAR MING