1
Q
What is Cohen’s d used for?
A
A measure of distance between 2 conditions’ means which takes variability (sd) into account
2
Q
Formula for Cohen’s d for population parameters
A
Cohen’s d pop. = difference between pop. means / mean SD`
3
Q
Cohen’s d formula from sample data
A
Difference between sample means/mean SD
3
Q
What does Cohen’s d measure?
A
-How many sds apart are the means?
-How much overlap there is between both distributions
4
Q
What are the arbitrary effect sizes?
A
0.2 = small
0.5 = medium
0.8 = large
in terms of overlap:
0.2 = 85%
0.5 = 67%
0.8 = 53%
5
Q
What is the research hypothesis for hypothesising a difference between 2 population means?
A
Pop mean A will be less than/more than/just different to pop mean B
6
Q
A
