Which one of the following is a formula of Karl Pearson's coefficient correlation?
A. $$r = \sqrt {\frac{{\sum XY}}{{\sum {X^2}\sum {Y^2}}}} $$
B. $$r = \frac{{\sum XY}}{{\sqrt {{Y^2} - \sum {X^2}} }}$$
C. $$r = \frac{{\sum XY}}{{\sqrt {{X^2} - \sum {Y^2}} }}$$
D. None of these
Answer: Option C
This Question Belongs to Commerce >> Business Statistics And Research Methods
Join The Discussion