=+70. The article “Evaluating the BOD POD for Assessing Body Fat in Collegiate Football Players”

(Medicine and Science in Sports and Exercise, 1999: 1350–1356) reports on a new air displacement device for measuring body fat. The customary procedure utilizes the hydrostatic weighing device, which measures the percentage of body fat by means of water displacement. Here is representative data read from a graph in the paper.

Obs BOD HW Obs BOD HW 1 2.5 8.0 11 12.2 15.3 2 4.0 6.2 12 12.6 14.8 3 4.1 9.2 13 14.2 14.3 4 6.2 6.4 14 14.4 16.3 5 7.1 8.6 15 15.1 17.9 6 7.0 12.2 16 15.2 19.5 7 8.3 7.2 17 16.3 17.5 8 9.2 12.0 18 17.1 14.3 9 9.3 14.9 19 17.9 18.3 10 12.0 12.1 20 17.9 16.2