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Designing Experiments
Designing experiments
Introduction

The experimental research method is a set of techniques that allows researchers to separate various sources of variance to better understand the effect that an independent (or possibly casual) variable may have on a dependent (or outcome) variable. This procedure takes place through a series of experimental designs or ways that research experiments can be carried out.

Key Features and Examples

For our purposes here, there are basically three types of design, each representing a set of different techniques. These classifications are based on the work by Campbell and Stanley (1963) in their seminal publication on experimental design and these sets of design differ on four variables, as summarized in Table 26.

  • random selection of participants from a population
  • random assignment of participants to control and experimental ...

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