250 Harris: RELATIONSHIP OF OVULES TO SEEDS 
The equation to the regression straight line is 
S$ = .1983 + .7745 0. 
The means and the fitted line are seen in FIG. 2. 
Except for the 
final class, 8, the agreement of the predicted and the observed 
means is excellent, so close, indeed, that it is impossible to represent 
it graphically on a diagram of the size to be published on our page. 
| { 
7 oe 
REGRESSION OF 
z SEEDS PER POD ON 
OVULES PER POD wa 
4 
5 on 
8 “a 
Gls. 
a. 
a+ 
rm 
Y bs. wt 
y 
ba cD ft 
y es 
& 5 
le & 2 
~~ z 
r i 
= 
Tt 
ao, fo ee ee ee 7 s 
OVULES PER POD 
Fic. 2 
To test more critically the linearity of regression, I determined 
the correlation ratio, », and compared it with the coefficient of 
correlation ry. I find 
7 = 
—— 
n-Tr= 
a very close agreement indeed. 
648443, 
-648226, 
.000217, 
