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t'   =   (1 - 2) - (μ1 - μ2)
( v1 + v2 )
 
n1n2
Where
  • t' is the unequal variance t'-statistic for which critical values are determined as below,
  • μ1 - μ2 is the difference between your population means,
  • 1-2 is the difference between your sample means,
  • v1 and v2 are the sample variances,
  • n1 and n2 are the number of observations in 1 and 2