STATISTICAL METHODS. 

 Offspring. 



It was desired to determine the correlation between the eye-color 

 of the offspring and that of their great-grandparents. Clearly the 

 ranges of the classes given above are not quantitatively equal nor 

 determinable Consequently a fourfold table was formed by dividing 

 the population into those having eyes whose color was gray blue-green, 

 or lighter, and those having dark gray, hazel, or darker eyes. This 

 gives a good basis for calculation If the dark gray and hazel eyes 

 had been grouped with the lighter eyes it would have made quadrant 

 a entirely too large; and there is nothing in the nature of the data 

 that strongly favors one division more than another. 



7 25 -388 

 1113 



.302785 



From the tables: 





Offspring 



h = .38532 + ( 1 .354 X .002785) = .389091 

 k = .17637 + (1.275 X .001060) = .177722 



