# Math Help - can this formula be used?

1. ## can this formula be used?

Can this formula:

...be used for correlation coefficient, when in my exam paper I am given the vaules:

Sxy Sxx Syy??

2. Correlation coefficent is equal to: $\frac{COV[XY]}{\sigma_x\sigma_y}$

3. Originally Posted by colby2152
Correlation coefficent is equal to: $\frac{COV[XY]}{\sigma_x\sigma_y}$

well it does help, its just the forumla that i have posted above is the formula which i am used to using.

So could i use that formula in any question for correlation coefficient?

xx

4. Originally Posted by leaaa
well it does help, its just the forumla that i have posted above is the formula which i am used to using.

So could i use that formula in any question for correlation coefficient?

xx
Yes, you may use that formula. It is the same one as I provided, but in sum notation. You said that you only have the joint standard deviations though.