Regarding inferences about the difference between two population means, the sampling design that uses a pooled sample variance in cases of equal population standard deviations is based on

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The use of pooled sample variance assumes that the two samples being compared are independent of each other. Therefore, the correct choice is independent samples. Research, pooled, and conditional samples do not accurately describe the sampling design in this scenario.

Regarding Inferences About the Difference Between Two Population Means, the Sampling