Oscar Benjamin added the comment:

I agree that the current wording in the doc-strings is ambiguous. It should be 
more careful to distinguish between

mu : true/population mean
xbar : estimated/sample mean

I disagree that the keyword arguments should be made the same. There is an 
important conceptual difference between these two things that the user needs to 
be aware of and mu, xbar - as symbols rather than ascii characters - are widely 
used for this. See e.g. this Wikipedia entry (although it uses ybar instead of 
xbar):
http://en.wikipedia.org/wiki/Variance#Population_variance

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nosy: +oscarbenjamin

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue20389>
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