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Lecture 8

FRHD 3070 Lecture 8: Week 8 – Experimental Designs

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University of Guelph
Family Relations and Human Development
FRHD 3070

1. Week 8 Experimental Designs Overview of Research Designs Descriptive Nonexperimental o Observational Method o Case Study method o Survey method Predictive nonexperimental o Correlational method o Quasiexperimental method Explanatory experimental o Experimental method True Experiments Posttest only design Pretestposttest design Random assignment to conditions Experimental control of all other variables o Given the above, any difference on the dependent variable should be due to the effect of the independent variable o Should try and reduce noise as much as possible Experimental Designs A pretest helps ensure that groups are equivalent before the IV was introduced With large enough groups, randomization usually ensures that groups are equivalent The larger the sample, the less likely it is that the groups will differ in any systematic way General rude is that you will probably need a minimum of 30 participants per condition to ensure no selection differences exist Pretest might be necessary when: o Small sample size
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