Week 7

Question 1

How is a repeated measures 2x2 ANOVA different?

Answer 1

Participants take part in all 4 groups

Run paired t-tests as post-hoc tests

Question 2

What is Cohen’s d?

Answer 2

A measure of effect size
The magnitude of the difference between 2 groups or conditions
Mean 1 - Mean 2 / Mean SD
Provides an indication of how much deviation there is between the 2 means in Standard Deviations
Small effect size = 0.2
Medium effect size = 0.5
Large effect size = 0.8

Question 3

What is Partial eta squared? (np2)

Answer 3

A measure of effect size
Global magnitude of the difference between groups or conditions
Effect / Effect+Error
Provides a measure of how much of the total variance is accounted for by the treatment effect
“This means that __% of the variance in _____ was attributable to the influence of the main effect of ____.”