use_t : bool, optional
if use_t is True, then t test results are returned
if use_t is False, then z test results are returned
alpha : float
significance level for the confidence interval, coverage is
1-alpha
usevar : string, ‘pooled’ or ‘unequal’
If pooled, then the standard deviation of the samples is
assumed to be the same. If unequal, then the variance of
Welsh ttest will be used, and the degrees of freedom are those
of Satterthwaite if use_t is True.
value : float
difference between the means under the Null hypothesis.
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