Table 12. — Chi-square analysis of bigeye tuna catches by hook 

 depth, John R. ".fanning Cruise 11„ 



Station 



1-3^ 



?r of fish 



Shallow 



hooks 



3 

 2 



Intermec 

 hooks 



Q 

 hooks 



9 

 3 



Total 

 number 

 of fish 



16 

 lit 



X 



3,875 

 6.1U2* 



Total 



13 



12 



30 



10 „ 01 7* Total x 2 Cd.f.U) 

 3,800 Pooled X 2 Cd.f.2) 

 6„ 21 7""- Interaction X 2 

 (d.f.2) 



H ypothesis ; The population of bigeye tuna is homogeneously distributed 

 with respect to depth; therefore a lrlsl ratio is expected 

 from the three depth zones. 



Conclusions ; The significant, interaction X 2 of 6,217 (d.f. 2, P<0,05) 

 indicates the data are not consistent; therefore the 

 pooled values cannot be accepted without reservation,, 



i/ Stations lumped to give minimum expected numbers of about 5>< 

 -"- indicates a significant (P<0.0£) chi-square value „ 



21 



