Question 306451
Check out this link.
http://mathworld.wolfram.com/CorrelationCoefficient.html

Plug your information into EXCEL where you can quickly manipulate data.
Find the average for x and y.
Then find the deviation of each data point from the averages.
SSxx=21.43
SSyy=256.86
SSxy=-36.29
Slope, b=SSxy/SSxx=-1.6933
b'=SSxy/SSyy=-0.141
r=b*b'=0.545
{{{xave=4.714}}}
{{{yave=10.857}}}
{{{yave=a+b*xave}}}
{{{a=18.84}}}
{{{y=18.84-1.693x}}}