Welch's two-sample t df is
- A
n₁ − 1
- B
n₁ + n₂ − 2
- C
n₁ + n₂
- Dcheck_circle
Approximate, by Welch-Satterthwaite formula
Explanation
Unpooled t uses an approximate df formula (often computed by software).
Setting Up a Test for the Difference of Two Population Means
AP Statistics· difficulty 4/5
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