A Researcher Is Estimating the Average Difference Between Two Population

question 20

Multiple Choice

A researcher is estimating the average difference between two population means based on matched-pairs samples.She gathers data on each pair in the study resulting in: Assume that the data are normally distributed in the population.A 95% confidence interval would be ___.

• A)-3.02 to -0.18
• B)-1.6 to -1.09
• C)-2.11 to 1.09
• D)-2.11 to -1.09
• E)-3.23 to 2.23

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