ALCOHOLISM AND BEHAVIOR OF WHITE RATS 



261 



DISTANCE PER DAY 



FREQUENCY DISTRI BUTIONS OF 

 RATIOS OF EACH TRIAL TO A STANDARD 



FREQUENCIES 



CONTROLS 



5.247 3.548 ^1.849 3.548 5.247 

 SCALE OF RATIOS l-i '-' TO l+) M") 



[+1 1.849 



CLASS WIDTH 1.699 



FREQUENCIES 

 450 



4362 3.767 3.152. 2.537 1:9.22 i-j U07 IS22 2.537 3.152 3.767 4.382 4.997 

 '-» .-1 (— ) I-) (-) TO <+) (+; (+1 (+.1 1+) '+> 



H-) U07 



CLASS \A/IDTH £15 



SCALE OF RATIOS 



Fig. 12 Frequency distributions used for the application of the x^ test. 

 Distributions of the ratios obtained by dividing each distance record into, or 

 by an assumed standard for the corresponding trial. 'Plus' ratios, those at the 

 right of the central point, were obtained when the record was larger than the 

 standard; 'minus' ratios, those at the left of the center, were obtained when the 

 record was smaller than the standard. These ratios are grouped in two ways: 

 into classes 1.699 and 0.615 wide. The numbers on the base line are the extreme 

 ratios included in the respective classes; the vertical scale gives the number of 

 ratios in each class. Broken lines are for the test ratios, solid lines for the con- 

 trol ratios. 



