When using independent samples to test the difference between two population means, a pooled variance is used if the population variances are unknown and assumed equal.

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This statement is true. When using independent samples to test the difference between two population means, a pooled variance is used if the population variances are unknown and assumed equal. This helps to estimate the common variance of the two populations and improve the accuracy of the test.

When Using Independent Samples to Test the Difference Between Two