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• t2S2 <br />nm _ Z <br />~dx~ <br />where: <br />nm =minimum sample size <br />s2 =Sample variance (n-1 degrees of freedom) <br />d =Precision (0.10 for cover and production; 0.15 for <br />woody plant density) <br />x =Sample arithmetic mean <br />t =The (a=.10) t-table value fora 1 tail t-test, n-1 degrees of <br />freedom (infinite degrees of freedom may be used if <br />n>30) <br />n =Sample size <br />After thirty (30) production samples in a BRB or reference area, sample adequacy was evaluated <br />initially based on green weight values (and later based on oven-dry weight values) using the <br />above formula. Testing will ultimately be based on oven-dry weight data. <br />. HYPOTHESIS TESTING APPROACHES -BRB-3 <br />For BRB-3, in which formal hypothesis testing was pursued, the following procedures were <br />followed: <br />Cover and Production <br />Percent absolute (foliar) first hit herbaceous vegetation cover of BRB-3 ? 90% of TWICE the <br />weighted absolute (foliar) first hit herbaceous vegetation cover from the reference areas <br />(weighted based on 83% original extent of Mountain Brush /Aspen and 17% original extent of <br />Sagebrush/Snowberry). The factor of 2x the reference area first hit herbaceous cover of the <br />reference areas is contained in the Seneca II permit document. <br />Total annual herbaceous production of BRB-3 z 90% of weighted total annual herbaceous <br />production from the reference areas (weighted based on 83% original extent of Mountain Brush / <br />Aspen and 17% original extent of Sagebrush/Snowberry). <br />The Mountain Brush/Aspen and Sagebrush/Snowberry Reference Areas were sampled to <br />adequacy to establish the standards for comparison against reclaimed area values. If after 15 <br />• 6 <br />