x1, x2 : array_like, 1-D or 2-D
two independent samples, see notes for 2-D case
alternative : string
The alternative hypothesis, H1, has to be one of the following
‘two-sided’: H1: difference in means not equal to value (default)
‘larger’ : H1: difference in means larger than value
‘smaller’ : H1: difference in means smaller than value
usevar : string, ‘pooled’ or ‘unequal’
If pooled, then the standard deviation of the samples is assumed to be
the same. If unequal, then the standard deviations of the samples may
be different.
value : float
difference between the means under the Null hypothesis.
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