Question: The d.f. for a Difference of Means test when we pool the variance is: (n1+n2) n-1 (n1+n2)-1 (n1-1)+(n2-1)

The d.f. for a Difference of Means test when we pool the variance is:

  1. (n1+n2)
  2. n-1
  3. (n1+n2)-1
  4. (n1-1)+(n2-1)

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