A Researcher Is Estimating the Average Difference Between Two Population

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: $$\begin{array} { | r | r | r | } \hline {\text { Pair } } & \text { Group 1 } & \text { Group } 2 \\\hline 1 & 10 & 12 \\\hline 2 & 8 & 9 \\\hline 3 & 11 & 11 \\\hline 4 & 8 & 10 \\\hline 5 & 9 & 12 \\\hline\end{array}$$ 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

Correct Answer:

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