statistics
posted by yorkie16 .
find the value for the correlation coefficient r.
x 5 1 4 2 3
y 5 10 12 4 8

We do not do your work for you. Here is a source with a (relatively) simple formula for calculating r.
http://davidmlane.com/hyperstat/A51911.html
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.
I hope this helps. Thanks for asking. 
I DID NOT ASK YOU TO DO MY HOMEWORK, I JUST WANTED THE FORMULA.....

the formula is pie r squared times 12