CompareMeans.zconfint_diff(alpha=0.05, alternative='twosided', usevar='pooled')
[source]
confidence interval for the difference in means
Parameters: 


Returns: 
lower, upper – lower and upper limits of the confidence interval 
Return type: 
floats 
The result is independent of the user specified ddof.
© 2009–2012 Statsmodels Developers
© 2006–2008 Scipy Developers
© 2006 Jonathan E. Taylor
Licensed under the 3clause BSD License.
http://www.statsmodels.org/stable/generated/statsmodels.stats.weightstats.CompareMeans.zconfint_diff.html