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. Sagebrush/Snowberry (SB) reference mean species density (omitting the <br />noxious weeds): 30.0 species per 100 sq.m. <br />mean-1.15*s=30.0-1.15(3.0)=26.7 <br />90% of the area-weighted reference area mean species density is calculated as <br />follows: <br />0.9*[(0.83*MB)+(0.17*SB)] = 0.9[(0.83*23.3)+(0.17*26.7)]=21.5 species <br />per 100 sq. m. <br />Mean total species density in BRB-3 = 22.9 species per 100 sq.m. <br />t-calculation: <br />tc = (21.5-22.9) / (7.3/20) _ -1.4/1.63 = -0.858 <br />Critical t (a= 0.1) _ +1.328 <br />Since tc is less than critical t, Alternative Test B is passed for BRB-3. <br />With regard to Alternative Test C, the similarity index between the lifeform species <br />density values for the prescribed lifeforms for BRB-3 and the Mountain Brush Reference <br />Area data was <br />Species Density <br />Lifeform BR63 MB Ave <br />AnnuaV Biennial Forbs 7.4 4.0 <br />Annual Grasses 1.2 0.2 <br />Perennial Forbs 6.7 16.0 <br />Perennial Cool Season Grasses 6.4 6.6 <br />calculated as follows: <br />ISmoMB = ((4.0+0.2+6.7+6.4)*2) / (7.4+4.0+1.2+0.2+6.7+1630+6.4+6.6) = 75.5% <br />The similarity index between the lifeform species density values for the prescribed <br />lifeforms for BRB-3 and the Sagebrush/Snowberry Reference Area data was calculated <br />as follows: <br />fL J <br />26 <br />