Chronic Fatigue Syndrome (CFS) Is a Debilitating Disease of Unknown

Multiple Choice

Chronic fatigue syndrome (CFS) is a debilitating disease of unknown etiology that is estimated to affect 17 million people worldwide. Studying peripheral blood mononuclear cells from patients with CFS, researchers identified DNA from a human gamma-retrovirus (XMRV) in 68 of 101 patients, compared with 8 of 218 healthy controls.
Which of the following two-way tables represents the study findings correctly?

A)
$\begin{array} { | l | c | c | } \hline & \text { XMRV } & \text { No XMRV } \\\hline \text { CFS patients } & 68 & 101 \\\hline \text { Healthy controls } & 8 & 218 \\\hline\end{array}$
B)
$\begin{array} { | l | c | c | } \hline & \text { XMRV } & \text { No XMRV } \\\hline \text { CFS patients } & 8 & 68 \\\hline \text { Healthy controls } & 101 & 218 \\\hline\end{array}$
C)
$\begin{array} { | l | c | c | } \hline & \text { XMRV } & \text { No XMRV } \\\hline \text { CFS patients } & 68 & 33 \\\hline \text { Healthy controls } & 8 & 210 \\\hline\end{array}$
D) $\begin{array} { | l | c | c | } \hline & \text { XMRV } & \text { No XMRV } \\\hline \text { CFS patients } & 76 & 319 \\\hline \text { Healthy controls } & 33 & 210 \\\hline\end{array}$