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Research Methods in Human-Computer Interaction, 2nd Edition by Harry Hochheiser, Jinjuan Heidi Feng, Jonathan Lazar

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Chapter 2

Experimental research

Abstract

Experimental research allows the identification of causal relationships between entities or events. Successful experimental research depends on well-defined research hypotheses that specify the dependent variables to be observed and the independent variables to be controlled. After a hypothesis is constructed, the design of an experiment consists of three components: treatments, units, and the assignment method. In an experiment, the process of sample selection and the assignment of treatments or experiment conditions needs to be randomized or counter balanced. Significance testing is used to judge whether the observed group means are truly different. All significance tests are subject to Type I errors ...

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