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t c _ xbr — 0-g ref <br />— <br />T <br />Sbr + (0.9 # $rsf ) <br />nbr nref <br />t _ 2193.0 — (0.9 M 1286.5) = 16.41 <br />1119654.6 (0.81 * 162650.9) <br />30 + 30 <br />SEsar <br />dfsa¢ _ ; <br />SEi,4g, + (0.9 * SE O f ) <br />nbr - 1 nraf - 1 <br />— 1119654.6 (0.81 * 1626SO.9) s <br />30 � 30 <br />d f�Q� — = 35.7 or 36 <br />(193.2 + + (0.9 - 76.2); <br />30 — 1 30— 1 <br />Since critical t� = 0.852 (one - tailed, alpha = 0.2, 36 dfsat) and t" is greater than this critical value, the <br />hypothesis of no difference is rejected. Consequently revegetation success for Phase III in BRB -5 <br />relative to the Sagebrush Reference Area is demonstrated. <br />WOODY PLANT DENSITY <br />Figure C -3 and C -4 graphically presents the "Background" and "Concentration Area" woody plant density <br />averages for the 2011 BRB -5, respectively. As can be seen, the 554.4 stems per acre observed in the <br />Background area far exceed the 90 stems per acre (90 percent of the 100 stems per acre background <br />standard) performance standard. The mean of 2035.6 stems per acre observed in the Concentration <br />areas also well exceeds the 900 stems per acre (90 percent of the 1000 stems per acre background <br />standard) performance standard. The total Concentration Area identified was 19.0 acres, or 7.1 % of the <br />BRB -5 (269.3 acres). Hence the standard that there would be at least 5% of the Phase III BRB block with <br />at least 1000 stems per acre has been met for 2011. <br />A reverse t-test of the assertion that the 2011 BRB -5 Background woody plant density is indistinguishable <br />from 90% of the standard is as follows: <br />dc <br />