A Researcher Is Estimating the Average Difference Between Two Population

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