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Experimental Design Essay

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Experimental designs are often referred to as the most "rigorous" of all research designs. It has been the "gold standard" against which all other research designs are compared. If a researcher can implement a good experimental design well, then the result of the experiment is probably the strongest with respect to internal validity. Internal validity is the most important consideration in all causal inferences. (Trochin, 2006)

Experimental studies aims to study cause-effect relationships (hypotheses) within a tightly controlled setting. It separates the cause from the effect in time. Experimental design administers the cause to one selected group of subjects (the “treatment group”) but does not do it to another group (“control group”). It …show more content…

One of these policies in the United States is the Americans with Disability Act (ADA. The ADA prohibits harassment and discrimination based on intellectual disability in the same way as federal laws prohibit harassment based on race, sex, colour, gender, national origin, religion or age. Approximately 20% of the all the employment discrimination law suits brought to court involve persons with intellectual disabilities. These persons are protected under the ADA against harassment based on …show more content…

The two group design which involves one treatment group and one control group was used for testing the effects of a single independent variable. The variable that was used was the mental development of children. The two groups were given pre-test and post-test questionnaires. Statistical analysis of this design involved an analysis of variance (ANOVA) between the results of the tests for both groups. The pre-test and post-test handled several threats to internal validity, which includes maturation, testing, and regression. These threats can always be expected to influence the treatment and control groups (Bhattacherjee,

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