PSYCH291 Lecture Notes - Lecture 19: Line Graph, External Validity
2 Jan 2017
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What causes large within-group variability: pre-existing individual differences (cont) Focus on change using a within-groups design to control for individual differences. Add more participants so full spectrum represented. What causes large within-group variability: ituatio(cid:374) (cid:862)noise(cid:863) Variability in external situation can create within- group variability. An experiment with more than one iv is called a: factorial design. Identifying factorial designs: this design is called a 2 x 2 factorial design. Each number indicates the number of levels of each independent variable. So in words the first factor has 2 levels (cell phone vs. no cell phone) and the second factor has 2 levels (younger vs. older: e(cid:454)plai(cid:374) i(cid:374) words what a (cid:1006)(cid:454)(cid:1007)(cid:454)(cid:1008) fa(cid:272)torial desig(cid:374) is . Iv #1 has two levels, iv #2 has three levels, Main effects = the overall effect of one particular independent variable: the main effect of one factor involves using the data for all levels of the other factor.
