In Constructing a Confidence Interval Estimate for the Difference Between

question 115

Multiple Choice

In constructing a confidence interval estimate for the difference between the means of two normally distributed populations, using two independent samples, we:

• A) pool the sample variances when the unknown population variances are equal
• B) pool the sample variances when the population variances are known and equal
• C) pool the sample variances when the population means are equal
• D) pool the sample variances when the unknown population variances are unequal
• E) never pool the sample variances

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