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Westem Wheatgrass / Alkali Sagebrush. A Two - sample t -test of Reverse Null Hypothesis with <br />Satterthwaite's Adjustment of the assertion that the 2011 BRB -1 allowable herbaceous production is <br />indistinguishable from Western Wheat / Alkali Sagebrush Reference Area allowable herbaceous production <br />is as follows: <br />t = <br />S2 + (0.9 * S re f <br />n br n ref <br />t = <br />d sat — <br />xbr — ( .9z,. <br />) <br />1882.5 — (0.9 * 934.2) <br />j 733596.4 (0.81 * 1944555) <br />30 + 30 <br />SE: <br />SEA + (0.9 * SE f ) <br />lb- 1 II re f- 1 <br />WOODY PLANT DENSITY <br />= 15.0 <br />— <br />( , j733596.4 (0.81 * 194.55.5) — + d f, _ 30 30 = 40.9 or 41 <br />(156.4+ + (0.9 * 80.5) <br />30- 1 30- 1 <br />Since critical tc = 0.851 (one - tailed, alpha = 0.2, 41 dfsat) and tc is greater than this critical value, the <br />hypothesis of no difference is rejected and revegetation success for herbaceous production Phase III is <br />demonstrated relative to the Western Wheat/Alkali Sagebrush Reference Area. <br />Figure C -3 and C-4 graphically presents the "Background" and "Concentration Area" woody plant density <br />averages for the 2011 BRB -1, respectively. As can be seen, the 247 stems per acre observed in the <br />Background area exceeds the 180 stems per acre (90 percent of the 200 stems per acre background <br />standard) performance standard. The 4209 stems per acre observed in the Concentration area far exceeds <br />the 1800 stems per acre (90 percent of the 2000 stems per acre background standard) performance <br />standard. The total Concentration Area identified was 20.4 acres, or 5.6% of the 2011 BRB -1 (362.25 <br />26 <br />