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Table 4.4-21. Statistical Comparison of Pe4ehnt Reference Sites and • <br /> Pre Mine Range Sites for Similarity as to Production 1/ <br />Permanent Reference SS, if N, Pre Mine SS= Xz N2 S= tcal 12.05,8 Rej,accept <br />Site (pooled) 2/ Range Site no 3/ <br />Mtn shrub 181,104.43 57.7 120 A/B 69,255.5 57.6 57 1430.63 0.12 +1.960 accept <br />Big Sagebrush- 4040624,049 65.5 141 C 98,810.0 69.8 47 2677.841 .0803 +1.960 accept <br />• a X - X where: R1 and X Z s The arithmetic means for groups (1) and (2). <br />t .L2(. <br />NO Ni and N2- The number of observations in groups (1) and (2). <br />(N?(NZ) Sz The pooled within-group variance. <br />S . <br />2/ <br />n <br />n <br />7 <br />3/ <br />5 <br />J <br />SS1 + SS2 <br />(N I- 1)+(N2-1) <br />Freeze, 1967 <br />where: SSi Xi- (TXl)2 <br />N <br />SSZ -FX2 - (1X2)2 <br />N2 <br />All data from the three permanent reference sites for a range Site were combined. <br />Ex. Mtn. Shrub permanent reference sites 1, 2, and 3 were combined, see Table 2 <br />no: <br />N4 : _A4 µ 2 <br />