628 



Fishery Bulletin 90(3), 1992 



CC 

 LU 



o 



a. 



+ 5yr A8yr D lOyr 



Figure 2 



Power of conclusions about lack of statistical significance for estimated 5, 8, and 10-year trends in dolphin abun- 

 dance. Power calculated for two-tailed noncentral t, assuming q = 0.10. Solid lines indicate maximum (7df) and 

 minimum (Idf) power envelope, d is the noncentral t parameter. 



