R help - Oct 2006 - Significant test on ratio's

Hi All,

I have measured set of induced expression values in
tumor samples with respect to normal samples. I
consider the expression value in normal samples as 1.
So, my final set of values (in total 10 values) are:
1:2.98 (normal:tumor), 1:1.5, etc.  Is it possible to
find significant value(s) among all the values? If so,
what kind of test I should use? 

I am doing all my analysis in R 2.3.1. 

Thanks in advance.

Regards,
Ezhil