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included within the disturbance area (see Exhibit 12-1 , Operations Plan) <br /> to allow ample area for highwall reduction and to achieve the proposed <br /> post-mine contours (Exhibit 12-5, Postmining Topography) . These areas <br /> will be disturbed only as dictated by the encroaching final grading <br /> activities. <br /> Tab 10 - Vegetation <br /> Comment 1. <br /> RESPONSE: <br /> The following details the various T-Test comparisons for the sagebrush <br /> grassland reference and affected areas. <br /> The T-Test used to determine tcalc is based on the CMLRD recommended <br /> method as shown below: <br /> t = xA xC where, s- = s_ x P nA + nC <br /> SX A- xC A C nA nC <br /> s2 = l nA-1 sA + K-1) s2 <br /> P ( nA-1 TC-1) <br /> xA = data mean, affected area. <br /> xC = data mean, reference area . <br /> t = two-tailed t value. <br /> s2A = variance, affected area samples. <br /> s2C = variance, reference area samples . <br /> nA = number of affected area samples . <br /> nC = number of reference area samples. <br /> trej = t value from table, two-tailed, 95 percent confidence, proper <br /> degrees of freedom, sign ignored. <br /> Cover (%) : Affected = x = 33.3 s = 12.6 n = 20 <br /> Reference = x = 35.8 s = 8.4 n = 10 <br /> 15 <br />