Psychology 2800E Lecture Notes - Lecture 5: Null Hypothesis, Statistical Hypothesis Testing, Analysis Of Variance
2 Mar 2017
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Document Summary
Iv"s can be manipulated as within-groups or between-groups. Implications for numbers of participants: different designs need different numbers of participants. Most studies don"t have more than 3 iv"s. Mixed design: one variable is within and the other is between. 3 main effects (1 for each iv): to find the main effects you find the average of each level of the ivs. 2-way interactions (interactions between each pair of ivs. 3-way interaction (interactions between all 3 ivs) If you had 3 ivs, you would have 4 interactions: a and b interact, b and c interact, c and a interact, and abc interact = 4 interactions total. If you only have 2 ivs, you only have 1 interaction. To calculate an interaction effect (difference in differences), you need to subtract the cells horizontally and see if there is a difference. Then look to see if the answers are different.
