The Following Data Was Collected as Part of a Study $\varepsilon$

The following data was collected as part of a study examining whether there is a differenc between the number of hours men and women watch television. The values represent the of hours a subject watched television on a designated Monday night. Lower values rank $\varepsilon$ higher ones.
$\begin{array}{l|llllllllllll}\text { Men } & 2.0 & 1.5 & 3.0 & 2.5 & 2.0 & 1.0 & 0.0 & 2.0 & 1.5 & 2.5 & 2.0 & 2.0 \\\hline \text { Women } & 2.0 & 2.5 & 1.0 & 1.0 & 1.5 & 2.5 & 2.0 & 1.0 & 2.0 & 1.5 & 1.0 & 0.0\end{array}$

Calculate $\mu _ { R } , \sigma _ { R }$ and the $z$ test value for the Wilcoxon rank sum test.

A) $\mu _ { R } = 150 , \sigma _ { R } = 5 , z = 4$
B) $\mu _ { R } = 150 , \sigma _ { R } = 17.32 , z = 1.15$
C) $\mu _ { R } = 12.25 , \sigma _ { R } = 12.25 , z = 9.61$
D) $\mu _ { R } = 12.25 , \sigma _ { R } = 150 , z = 0.79$