**The unequal variance (Welch) t test - FAQ 1568 - GraphPad**
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Jan 31, 2010 · For the unequal variance t test, the null hypothesis is that the two population means are the same but the two population variances may differ. If the P value is large, you don't reject that null hypothesis, so conclude that the evidence does not persuade you that the two population means are different, even though you assume the two populations have (or may …

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