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asked in Statistics by (820 points)  
  

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answered by (820 points)  
The test statistic is : t=ˉx1ˉx2sp1n1+1n2

The degrees of freedom are found using a complicated approximation formula. You won’t have to do that calculation "by hand", but is done by: DF=(s21n1+s22n2)21n11(s21n1)2+1n21(s22n2)2

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