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Reference Area <br />Species li in Quarters <br />Q. gambellii 22/92 = .24 <br />P. edilis 37/92 = .40 <br />J. monosperma 17/92 = .19 <br />J. scopulorum 16/92 = .17 <br />z <br />Number of trees in 100m <br />z <br />~~ of trees in 100m <br />1.3 <br />2.1 <br />1.0 <br />0.9 <br />Affected Area Reference Area <br />1.5 1.3 <br />4.5 2.1 <br />1.9 1.0 <br />1.4 0.9 <br />9.3 5.3 <br />nl = 4 nz = 4 <br />xl = 2.3 x2 = 1.3 <br />s = 1.61 s = .75 <br />Ho ul = uz and there is essentially no difference between <br />population samples <br />t = xi - xz <br />2 2 <br />where = N151 + NzSz <br />~ 1/N1 + 1/Nz ~ <br />N1 + Nz - 2 <br />