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2) Sample Adequacy Expression <br />s t <br />N = d2-2 <br />s _ 15.0 * 1.740 <br />d x 43.89 18 <br />= 0.140 <br />+ d = 43.89 + (43.89 * 0.140) = 50.04 <br />50.04 percent allowable herbaceous cover represents the highest possible value of the true mean for the <br />Mountain Brush Reference Area. <br />[Note in the above two- tailed t values with n -1 degrees of freedom are used. We are concerning ourselves <br />with the full range of possible values for mean, thus bi- directional concerns are evident. From the CDRMS <br />point of view this pushes the limits out further and produces the highest maximum value for the mean (at <br />90% confidence)] <br />Calculation of 90 percent of the cover performance standard appropriate for 2011 sampling using the <br />highest possible value for the Mountain Brush Reference Area component is demonstrated below. <br />Aspen Reference Area Allowable All -Hit Herbaceous Cover' = 91.3% <br />Mountain Brush Reference Area Allowable All -Hit Herbaceous Cover' = 50.04% <br />Sagebrush Reference Area Allowable All -Hit Herbaceous Cover' = 30.1% <br />Steep Mountain Brush Reference Area Allowable All -Hit Herbaceous Cover' =32.2% <br />Western Wheatgrass/ Alkali Sagebrush Reference Area Allowable All -Hit Herbaceous Cover' = 45.4% <br />' Herbaceous cover adjusted by subtracting noxious weeds and annual/biennial plant cover in excess of 10% of the remainder. <br />90 percent of the Cover Standard = <br />0.90* [0.11(91.3%)+0.35(50.04%)+0.31(30.1%)+0.13(32.2%)+0.10(45.4%)] = 41.0 <br />The mean allowable all -hit herbaceous vegetation cover sampled in 2011 BRB -1 was 57.7 percent, <br />exceeding 41.0 percent, which is 90 percent of the upwardly adjusted cover performance standard. Thus <br />for 2011, successful revegetation with respect to allowable all -hit herbaceous cover is indicated. <br />21 <br />