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Chronic fatigue syndrome (CFS) is a debilitating disease of unknown etiology that is estimated to affect 17 million people worldwide. In a case-control observational study, researchers identified DNA from a human gammaretrovirus (XMRV) in 68 of 101 CFS patients (67%) compared with 8 of 218 (3.7%) healthy controls. XMRV No XMRV CFS patients 68 33 Healthy controls 8 210 Do the data show evidence of a relationship between XMRV and CFS? The value of the test statistic is 154.1. Using significance level of 5%, you conclude O that there is significant evidence that XMRV causes CFS in a large fraction of the CFS patients O that the data are consistent with the null hypothesis of no relationship between XMRV and CFS. that there is significant evidence of a relationship between XMRV and CFS, and XMRV is much more frequent among CFS patients than would be expected if there was no such relationship. O nothing because the test assumptions are not met