Ilich-Ernst et al. (A-4) investigated dietary intake of calcium among a cross section of 113 healthy women ages 20–88. The researchers formed four age groupings as follows: Group A, 20.0–45.9 years; group B, 46.0–55.9 years; group C, 56.0–65.9 years; and group D, over 66 years. Calcium from food intake was measured in mg/day. The data below are consistent with summary statistics given in the paper.

Age Groups (Years) Age Groups (Years)

A B C D AB C D 1820 191 724 1652 1020 775 2588 1098 613 1309 805 1393 2670 644 918 1002 631 533 1022 136 949 966 641 734 1555 1605 877 788 760 485 222 1247 1368 472 449 1197 1529 1692 471 236 1249 1422 697 771 831 1520 445 849 869 698 489 990 1199 513 167 2575 489 429 731 824 1426 2408 798 1130 448 1846 1064 631 1034 991 1088 629 1016 1261 590 912 1025 42 994 1383 948 767 1781