Statistics Help Please
posted by Stuart on .
A sample of eight observations of variables x and y is shown below:
x 5 3 7 9 2 4 6 8
y 20 23 15 11 27 21 17 14
Find the value of coefficient of correlation, r.
a)  0.991
b)0.872
c) 0.512
d)0.942

I'll narrow it down for you. It's either a) or d).
If you need to do this by hand, find a correlation coefficient formula, plug in the values and go from there to find r.