Factorial Design Ch. 12 Thursday, July 16

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Factorial Design (Ch. 12)Thursday, July 16
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Experimental Design

• Simple experiment
• two levels of one independent variable
• Multi-level experiment
• three (or more) levels of one independent
  variable

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More than two IVs? Example

• First independent variable time
• 2 levels 1 hour vs. 4 hours
• Second independent variable setting
• 2 levels in-class vs. out-of-class

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Factorial Experiment

• An experiment that examines two or more
  independent variables (factors) at one time
• Analysis ANOVA

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Factorial Design - Example
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Factorial Experiment

• Main effect the average effect of a treatment
• Interaction the effect of a treatment is
  different, depending on the level of the second
  IV the effect of one IV is not consistent across
  levels of the other IV

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Possible Outcomes of a2x2 Factorial Experiment

• 1. No ME VarA No ME VarB No INT
• 2. ME VarA No ME VarB No INT
• 3. No ME VarA ME VarB No INT
• 4. ME VarA ME VarB No INT
• 5. ME VarA ME VarB INT
• 6. No ME VarA No ME VarB INT
• 7. ME VarA No ME VarB INT
• 8. No ME VarA ME VarB INT