You Are Testing the Difference Between Two Population Means

question 35

Multiple Choice

You are testing the difference between two population means.Which of the following best describes the pooled sample standard deviation under the assumption that the two population standard deviations are equal for small samples?

• A)it is the square root of the weighted average of the sample variances, weighted by their respective degrees of freedom
• B)it is a simple average of the sample standard deviations
• C)it cannot be calculated for small samples
• D)it is the square of the differences of the sample variances
• E)none of the above

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