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

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The test statistic is:


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,
is 1 if Bessel's correction for Means is selected in Statistical Assumptions and 0 otherwise,
and are the sample variances in the two groups,
is Extra Deff.