Can anyone make a conclusion with this graph. I need trends, patterns, and differences?

Question

http://img230.imageshack.us/my.php?image=16755113mz8.png

btw, my hypothesis is that The lower your body fat percentage, the greater score you will get in the Bleep Test.

Answer 1

You need to look at the statistics of the linear fit, specifically the r^2 (which explains the fraction of the variance explained by the fit) and slope of the line.  There are statistical tests you can do on r^2 to see if the value is significant statistically (i.e., the linear fit explains more of the variance than would be suggested by chance alone).  You can also test that the slope with its associated uncertainty is statistically different than zero.  

Just from eyeballing the data, it appears both r^2 and the slope would be significant and there is a correlation between BFP and the Bleep score.