Correlations / Signidicance Testing - Week Ten Flashcards
1
Q
What does r tell us
A
The sample correlation coefficient
Calculated from data/ estimate / changes when study repeated
2
Q
What dies P tell us
A
Population correlation coefficient
True unknown correlation
Unchanged when repeated
3
Q
Strength and data quality
A
True effect = Lower precision decreases strength of correlation in sample (smaller r)
4
Q
How do you calculate the amount of variance?
A
R^2
5
Q
What does coefficient of determination tell us?
A
- What proportion of the variance in one variable is explained by the other variable
- From 0 to 1
- Remainder explained by random data/confounding variables
- More variables explaining IV = r decreases
