Chapter Outline
The Uniqueness of Experimental Research
Essential Characteristics of Experimental Research
Manipulation of the Independent Variable
Randomization
Control of Extraneous Variables
Group Designs in Experimental Research
True Experimental Designs
Quasi-Experimental Designs
Factorial Designs
Control of Threats to Internal Validity: A Summary
Evaluating the Likelihood of a Threat to Internal Validity in Experimental Studies
Control of Experimental Treatments
An Example of Experimental Research