When Testing the Difference Between Two Population Means, the Variances

question 128

Multiple Choice

When testing the difference between two population means, the variances are pooled when

• A) the population standard deviations are known and equal.
• B) the population means are known.
• C) the population standard deviations are assumed unequal and unknown.
• D) the population standard deviations are assumed equal but unknown.

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