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Table 4.4-21. Statistical Comparison of Pe ant Reference Sites and <br /> Pre Mine Range Sites for Similarity as to Production 1/ <br /> Permanent Reference SSQ N, Pre Mine SSA Xt N2 SZ tcal t2.05,8 Rej ,accept <br /> Site (pooled) 2/ Range Site Ho 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- 404,624,049 65.5 141 C 980810.0 69.8 47 2677.841 .0803 +1.960 accept <br /> Z_ X o X where: X, and XZ a The arithmetic means for groups (1) and (2). <br /> t S2(Nl+N2) Ni and N 2 = The number of observations in groups (1) and (2). <br /> S Z The pooled Within-group variance. <br /> t SS1 + SSa where: SS -EX, (FX )� <br /> S = (N1-1)+(N2-1) N <br /> SS2 =,tXz - (5:XZ)2 <br /> N2 <br /> 1/ Freeze, 1967 <br /> 2/ 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 /> 3/ Ho: ,�la=•�tZ <br /> `i <br /> 'H4: .A4114.�2 <br /> J <br />