When Testing the Difference Between Two Population Means,the Sample Variances

question 38

Multiple Choice

When testing the difference between two population means,the sample variances are pooled to estimate the population variance when ________.

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

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