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Table 4.4-4. Calculation of historic herbaceous cover on premine range sites A, B, and <br />C and corresponding confidence interval. <br />Range x annual <br />Site Year % cover x q Calculated confidence interval <br />A 1979 23.0 .56 .44 y = .9 z ± 5n, (x.1 { z q) /n) <br />1980 34.7 <br />1981 69.8 y =.9(.56):t (1.895)(.1876) <br />1982 75.2 <br />1983 54.9 y = 14.85% cover <br />1984 74.5 <br />1985 59.9 Based upon the USLE, 14.85% cover is <br />insufficient to control excessive soil erosion. (1) <br />S 1979 22.0 .482 .518 y = .9 'x ± tn, a .1 (SRc q) !n) <br />1980 40.6 <br />1981 53.2 y = .9(.482) : (1.895)(.1887) <br />1982 51.2 <br />1983 54.3 y = 7.62% cover <br />1984 65.1 <br />1985 51.1 Based upon the USLE, 7.82% cover is <br />insufficient to control excessive soil erosion. (1) <br />A 1979 23.6 .488 .512 y 9 � ± 5n cc .1F(x q) /n) <br />- <br />1980 26.2 <br />" <br />1981 59.8 y = .9(.512) <br />1982 88.4 ti <br />1983 61.3 y = 10.28% cover <br />1984 49.4 <br />1985 52.7 Based upon the USLE, 10.28% cover is <br />insufficient to control excessive soil erosion. (1) <br />(1) Table 1. <br />iHBHlb 5/87 Retyped 5/96] <br />4-108 <br />'Revision: '+ P - I I <br />Approved: --7- SSS <br />