Two-sample t procedures are more robust than one-sample t procedures.

Name: Two-sample t procedures are more robust than one-sample t procedures.
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Two-sample t procedures compare means between two independent groups, making them more robust than one-sample t procedures, which compare a single sample mean to a known population mean. With two-sample t procedures, any differences between the groups can be taken into account, reducing the impact of outliers or other sources of variability.

Two-Sample T Procedures Are More Robust Than One-Sample T Procedures