Table B-1. Calculated number of quantitative samples required to estimate unionid density at three 

 sites in Reach 15 (UMR) within x% of the actual density with a 0.05% probability of 

 being incorrect. Based on the formula : n = [(2SD) ^ (xM)]-, where : n = number of 

 samples required, SD = standard deviation, x = desired level of accuracy (i.e., 10% = 0.1), 

 and M = mean unionid density based on samples collected Numbers within rectangles 

 indicate the number of samples collected met or exceeded the number of samples 

 required for each level of accuracy (%). 



Reach 15 (UMR) 



Page B-2 



Whitney et al.. Unionid Sun'ey - Reach 1 5 UMR 



