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2) Sample Adequacy Expression <br />S2t2 <br />N = d2x2 <br />d = �((s2t)/(x2N)) = x((21.422* 1.3412)/(40.682* 16)) = 0.176 <br />X + d = 40.68 + (40.68 *0.176) = 47.9 <br />47.9% allowable herbaceous cover represents with 90% confidence the highest possible value of <br />the true mean for the Mountain Brush Reference Area in 2014. <br />Cover Success Evaluations <br />Calculation of 90 percent of the cover performance standard determined from 2012 and 2014 <br />sampling is demonstrated below based on the reference area data that is weight averaged by type. <br />The approximate weighting contribution is aspen 24.4%, mountain brush 48.9%, sagebrush <br />24.0%, and steep mountain brush 13%. <br />2012 <br />Calculation of the cover performance standard for 2012 sampling data, and using the highest <br />possible value for the Mountain Brush Reference Area component as described above, is <br />demonstrated below. <br />Aspen Reference Area Allowable All -Hit Herbaceous Covers = 53.7% <br />Mountain Brush Reference Area Allowable All -Hit Herbaceous Cover' = 32.1%2 <br />Sagebrush Reference Area Allowable All -Hit Herbaceous Cover' = 30.8% <br />Steep Mountain Brush Reference Area Allowable All -Hit Herbaceous Cover' = 14.4% <br />1 Herbaceous cover adjusted to allowable by subtracting noxious weeds and annual/biennial <br />plant cover in excess of 10% of the remainder. <br />1 Highest possible value of the true mean calculation <br />The calculation of 90 percent of the 2012 Cover Standard = <br />0.90* [0.244(53.7%) +0.489(32.1%) +0.24(30.8%) +0.027(14.4%)] = 32.9 <br />The 2012 mean allowable all -hit herbaceous vegetation cover sampled in the BRB-1 area was <br />47.8 percent, exceeding the cover standard of 32.9 percent (90 percent of the upwardly adjusted <br />SL -6 - 11 <br />