Often we have two data samples, maybe from different experiments, that are somehow related. Statistical tests exist that can compare the samples. Some of these are implemented in the scipy.stats module.

Another statistical test that I like is the Jarque–Bera normality test from scikits.statsmodels.stattools. SciKits are small experimental Python software toolkits. They are not part of SciPy. There is also pandas, which is an offshoot of scikits.statsmodels. A list of SciKits can be found at https://scikits.appspot.com/scikits. You can install statsmodels using setuptools with:

$ [sudo] easy_install statsmodels