PSYCH 241 Lecture Notes - Lecture 7: Psych
18 Oct 2016
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Independent group designs between subject variable: random groups, matched groups, natural groups. 1 way independent groups design with 2 levels. Repeated measures designs within subject variable: complete counterbalancing. Any design with two or more independent variables: many are possible we will stick to two factors (ivs) Three questions can be answered with 2-way factorial. Interaction the effect of two independent variables combining to produce a result different from that produced by either variable alone: when lines on graph are not parallel, there is an interaction. Step 1: identify ivs (including levels) and dv(s) Step 2: create a table that captures ivs and levels of each. Step 3: fill in any data you have (where did scores come from?) Step 4: check for main effects (marginal means for both ivs) Step 5: check for an interaction (subtract scores for two levels) Step 6: plot the data to visualize differences. Step 8: design of the study? (identify the design, including levels)
