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PSYC227_fall09_2wayANOVA

PSYC227_fall09_2wayANOVA - Two-Factor ANOVA Independent...

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Two-Factor ANOVA Independent Measures Learning Objectives Understand the definitions of a main e ect for one factor and an interaction between two factors, and be able to recognize an interaction from a description or a graph of experimental results. Be able to compute a two-factor analysis of variance. Be able to interpret the measure of e ect size for main e ects and for interactions. Understand simple main e ects
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Example: effects of temperature and humidity on performance - Two-factor experiment Factors: humidity (2 levels: low and high) temperature (3 levels: 70, 80, 90) Does humidity effect performance? Mean difference between the 2 humidity levels. Does temperature effect performance? Mean difference between the 3 temperature levels. Is performance effected by a combination of temperature and humidity? Any other mean differenced due to unique combinations of a specific temperature and a specific humidity level.
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