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what are FActorial designs?
experimental designs involving more than one IV
WHy do we want to manipulate more than one variable?
-to study multiple variables at once
-we may have reason to belive that the effects of one variable on anohter are conditional upon a third variable
example: it may be the case that people behave aggressively after viewing a violent tv show depends on whether they have been provoked or threatened
Types of effects in factorial research designs
main effect and interaction
effect of one independent variable
effect of one independent variable depends on level of other independent variables
If all axis have same mean then...
- no for both categories.
- *if not then yes
Interaction ocurs when the lines ...
Factorial designs summary
- -enable us to test multiple IVs in the same study
- *can rule out alternative explanations
- *can test the interactive effect of mulitple variables
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