The Welch-Satterthwaite test is more conservative than the pooled variance test to compare two population means with unknown variances in independent samples.

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The Welch-Satterthwaite test is more robust than the pooled variance test and takes into account the differences in sample sizes and variances between the two populations. Therefore, it is usually more conservative and accurate than the pooled variance test in these situations.

The Welch-Satterthwaite Test Is More Conservative Than the Pooled Variance