FISHERY BULLETIN: VOL. 87, NO. 3, 1989 



where £■„,;, indicate arithmetic mean of untransformed biomasses, analogous to .r in 

 Equation (1). 



And therefore, from Equations (3) and (4), a critical ratio was defined: 



/ / "a + «6 \ 



(5) 

 E,  "" - 



which is the minimum ratio necessary to reject the null hypothesis. 



Note, however, that the correcting factors (0.5 sf,) cancel each other only when 

 using a ^test with pooled s~, i.e., when assuming the two samples belong to the same 

 distribution. 



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