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