Peak blood level data (in mg/ml) were obtained for 20 patients for a single dose 
of a drug. In addition to the blood level, the patient's weight (in lb) and the 
amount of drug (in mg) were recorded. The data can be found in blood.dat, with level 
(column 1), dose (column 2), and weight (column 3). 

SOURCE: Ott, R.L. An Intro to Stat Methods and Data Analysis, 
         Third edition, p. 350 / 496