Table 23. — Influence of temperature upon activity 
Mean nightly temperature (range in degrees Fahrenheit) 
15. 0 to 
25. 0 to 
35. 0 to 
45. 0 to 
55. 0 to 
65. 0 to 
75. 0 to 
24. 9 
34. 9 
44. 9 
54. 9 
64. 9 
74. 9 
84. 9 
Number of nights 
7 
58 
84 
54 
43 
25 
2 
Mean activity units per rat per night. 
16. 57 
19. 38 
15. 74 
22. 07 
25. 33 
24. 80 
18.00 
Estimate of variance squared 
14. 29 
90. 24 
50. 24 
135. 92 
146. 84 
60. 17 
0 
F = 6.70; significant below the 1 percent level of confidence. 
Squared correlation ratio =0.131 (i.e., 13 percent of the total variance is attributable to the effect of temperature). 
Statistical tests by Dr. Ardie Lubin. 
CALCULATED 
NUMBER OF OBSERVATIONS 
TEMPERATURE DEGREES FAHRENHEIT 
Figure 99 — Observed and calculated (i.e. expected) intensity of activity in relation to temperature. 
128 
