Table B-4. Calculated number of quantitative samples required to estimate unionid species density at 

 Dliniwek (RM 492.4) in 1 994-95 (98 samples collected) within x% of the actual density with 

 a 0.05% probability of being incorrect. Based on the formula : n = [(2 SD) - (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 (%>). 



Page B-5 



Whitney et al, Unionid Survey - Reach 1 5 UMR 



