Independent Samples t-Test - Comparing Two Means with Unequal Variances

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The test statistic is:

where:

and are the average values of variables and respectively, where each of these variables represents the data from two independent groups,
the groups have sample sizes of and respectively,
and are the variances in the two groups,
,
,
is 1 if Bessel's correction is selected for Means in Statistical Assumptions and 0 otherwise,
is Extra Deff.