170 
Table I. - Comparison of Air and Ground Counts by Coverages, 1951, 1952 and 1953 


Observed Territories Ratio 
Comparison Date Ground Air Ground to Air 
1951 
Air II; Ground IV Mid- May 78 161 2.064 
Air III; Ground VII _ Late June 64 143 2.093 
and VIII (average) 
Air IV; Ground IX Mid-July 40 101 2.525 
Average Ratio 2.231 
Chi-square = .8487 Good fit - average ratio may be used, 
Chi-square .5 =1.386 2D.F. 
1952 
Air I; Ground II Late April 96 149 1.55 
Air II; Ground III Early May 86 130 1.51 
Air III; Ground IV Late May 67 119 1.78 
Air IV; Ground V Early June 71 104 1,46 
Air V; Ground VII Early July 60 80 1,33 
Average Ratio | 1,52 
Chi-square = 1.704 Good fit - average ratio may be used. 
Chi-square .5 = 3.357 4D.F. 

1953 
Air 1; Ground I Late April 115 171 1,49 
Air II; Ground II Mid-May 93 142 1.53 
Air III; Ground III Mid-June 60 77 1.28 
Average Ratio 1.43 
Chi-square = .756 Good fit - average ratio may be used, 
Chi-square .5 =1.386 2D.F., 
Average Ratio 1952-1953 1.49 
Chi-square = 2.690 Good fit - average ratio may be used, 
Chi-square .5 = 6.346 7D.F. 
