Data are from Bender, Douglass, and Kramer (1982), Statistical Methods for Food 
and Agriculture, p. 98. Absolutely no information is given on where the data come 
from, so they might very well be fake.

Data are heights (in hands) of yearling colts sired by one of 7 thoroughbred sires.
The sires are assumed to have been chosen at random from some larger population of 
sires.