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<br />Table 4. Example calculation, production standard, Range site B <br />Range Site B (A unpaired two sample T test for the one tailed hypothesis) <br />Ho: ul ~ u2 ul = Pos[ Mine Site <br />Ha: ul < u2 u2 = Historic Avg. <br />Post Mine Site Historic Avg ~v <br />21.26 21.26 1979 <br />50.97 1980 <br />55.53 1981 <br />77.00 1982 <br />75.50 1983 <br />80.13 1984 <br />75.28 1985 <br />ssl = v1s21 vl = 0 v2 = 6 ss2 = v2s2y <br />zl = 21,28 x2 = 62.24 <br />s21 = 0 s22 = 455.86 <br />asl = 0 ss2 = 2735.16 <br />s2p = ssl + ss2 t = zl - .9z2 <br />vl + v2 <br />s2P + s2P <br />nl n2 <br />s2P = v1s12 + °2s22 <br />vl + v2 <br />s2p = 0 + 2735.16 <br />0 + 6 <br />t = 21.26 - 56.02 <br />455.86 + 455.86 <br />1 7 <br />s2p = 455.86 gms2 t = 21.26 - 56.02 = -1.523 <br />22.83 <br />From Table B.3 (Zar) [.1(1)17 = 1.415 (one tailed test) <br />Therefore, reject Ho, area has not been reclaimed to meet minimum <br />production <br />Zar (1984), Sec. 9.4 (testing for the difference between two means). <br />HBH/jb 6/87 <br />