phospotassium
19. Phosphorus and Potassium in Food. The following data represent independent random samples taken from a population of food items, recording the amount of phosphorus in the first sample and the amount of potassium in the second sample (both measurements are in milligrams). Test whether the population median amount of phosphorus differs from the population median amount of potassium, using level of significance .
| Phosphorus (mg) | 424 14 36 121 395 0 927 222 143 97 66 31 140 142 0 110 89 131 54 71 7 129 56 117 34 |
| Potassium (mg) | 106 387 627 237 66 31 50 103 18 265 271 62 17 132 302 7 336 292 298 278 |