For the Following Data, What Is the Mean of the Difference

question 9

Multiple Choice

For the following data, what is the mean of the difference scores? $$\begin{array} { | r r } \hline { \text { Before } } & \text { After } \\\hline 160 & 153 \\\hline 125 & 124 \\\hline 142 & 136 \\\hline 187 & 167 \\\hline\end{array}$$

• A) 8.50
• B) 5.00
• C) 4.26
• D) 11.33

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Definitions:

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