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Table 2.04.10 -15 Page 2 <br />Since the t,, value of 0.641, is less than the tt value of 1.684, it can be concluded that the mean <br />total plant cover the Greasewood Predisturbance Area is equal to the total plant cover of the <br />Greasewood Reference Area. <br />Perennial Production <br />Comparison of perennial herbaceous production for the Greasewood Reference Area and the <br />Greasewood Predisturbance area. Where the Pre - Mining Comparison found on page 16 of the <br />Guidelines for Compliance with Land Use and Vegetation Requirements of the Colorado <br />Mined Land Reclamation Board for Coal Mining, issued in October, 1988 contains the <br />following formula: <br />t' = Xra - Xpd <br />------------------------------- <br />\! 0ni_ -1 S2 _ +n� 1 S2pd <br />(n,a + npd) - 2 <br />where using the N, mean and SD values found in Table 2.04.10 -2, yields the following <br />which yields: t, = 9.51-13.39 <br />--------------------------------- <br />V (50 -1) 5.632 + (50 -1) 7.682 <br />(50+50)-2 <br />which yields: tc = 3.88 <br />------------------------------------ <br />V (49) 31.6969 + (49) 58.9824 <br />98 <br />which yields: tc = 3.88 <br />------------------------------ <br />V 1553.1481+ 2890.1376 <br />98 <br />which yields: tc = 3.88 <br />--------------------- <br />\! 4,443.2857 <br />98 <br />which yields: tc = 3.88 <br />------------------ <br />\! 45.3397 <br />which yields: tc = 3.88 <br />-------- - - - - -- = t, 0.5762 <br />6.7335 <br />