CRCJ 3001 Chapter Notes - Chapter 11: Factorial Experiment, Drug Interaction, Statistical Hypothesis Testing

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Experimental factorial designs: factor: an iv in an experiment, esp. those that include two or more ivs, factorial design: research design that includes two or more factors, ex. 2 x 3 factorial design two-factor design w 2 levels of first factor & 3 levels of second factor = total of 6 treatment conditions: ex. The interaction btwn factors: interaction: whenever one factor modifies the effects of a second factor, unique mean diffs not explained by main effects of the 2 factors. Interpreting main effects & interactions: mean diffs are simply descriptive & must be evaluated statistically before being considered significant, obtained mean diffs may not represent a real treatment effect but rather may be caused by chance or error. 11. 3 types of factorial designs & analysis. B-s & w-s designs: b-s, disadvantages, requires large number of participants, ex. 2 x 4 factorial design = 8 treatment conditions w 30 participants in each = total of 240 participants required.

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