Correlation Flashcards
1
Q
What is the formula to calculate Sˣˣ?
A
Σ(x²)-((Σx)²)/n)
2
Q
What is the formula to calculate Sʸʸ?
A
Σ(y²)-((Σy)²)/n)
3
Q
What is the formula to calculate Sˣʸ?
A
Σ(xy)-(Σ(x)Σ(y)/n)
4
Q
What is the product moment correlation coefficient?
A
A measure of how strong a correlation is between two variables
5
Q
How is the product moment correlation coefficient notated?
A
r
6
Q
What is the formula to calculate the product moment correlation coefficient?
A
Sˣʸ/√(SˣˣSʸʸ)
7
Q
How can the product moment correlation coefficient be interpreted?
A
If it’s near 1, there is a strong positive linear correlation. If it’s near 0, there is little linear correlation. If it’s near -1, there is a strong negative linear correlation
8
Q
What effect does coding have on the product moment correlation coefficient?
A
None
