A Researcher Is Conducting a Matched-Pairs Study Assume That the Data Are Normally Distributed in the Population

A researcher is conducting a matched-pairs study.She gathers data on each pair in the study resulting in: $$\begin{array} { | c | c | c | } \hline \text { Pair } & \text { Group 1 } & \text { Group 2 } \\\hline 1 & 10 & 12 \\\hline 2 & 8 & 9 \\\hline 3 & 11 & 11 \\\hline 4 & 8 & 10 \\\hline 5 & 9 & 12 \\\hline\end{array}$$ Assume that the data are normally distributed in the population.The degrees of freedom in this problem are _______.

A) 4
B) 8
C) 5
D) 9
E) 3

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