Analysis 

 1 

 2 

 3 



Coefficient 

 of Variation 



45.5 

 101.6 

 203.5 



LU 



1.0 n 



0.8 



0.6 



0.4 



0.2 



0.0 



«^-« 



T 1 1 1 r- 



9 10 11 12 13 



3 4 5 6 7 



NUIVIBER OF SUBSAMPLES 



(a) 



-I — I — I 



14 15 16 



1.0 



0.0 



-1 1 1 1 1 1 1 1 1— I 1 



10 12 14 16 18 20 22 24 26 28 30 



NUtVlBER OF SUBSAMPLES 



(b) 



Reference: Tetra Tech (1 986b) 



Figure D-2 Power of statistical tests vs. number of subsamples in composite 

 replicate samples. Fixed design parameters; number of stations 

 5, number of replicates = 5, significance level = 0.05, minimum 



detectable difference = 100 percent of overall mean value. 



