I'wo assay methods for measuring the level of vitamin B12 in red blood cells were compared. Blood samples were taken from 14 healty adults, and, for each blood sample, the B12 level was determined using both methods. The resulting data are: Use the Wilcoxon sign test and Subject 1 2 3 4 5 6 7 8 Method 1: 204 238 209 277 197 227 207 205 Method 2: 204 238 198 253 180 209 217 204