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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 />• <br />Range x annual _ <br />Site Year % cover x q Calculated confidence interval <br /> y <br />q <br />A 1979 23.0 .56 .44 <br />= .9 x ± Sn, a .1 (z <br />) /n) <br />1980 34.7 <br />" <br />1981 69.8 y =.9(.56) ±(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 /> n n n n <br />B 1979 22.0 .482 .518 y = .9'x ± tn, a .1 (k q) /n) <br />1980 40.8 <br />1981 53.2 y =.9(.482) ±(1.895)(.1887) <br />1982 51.2 ~ <br />1983 54.3 y = 7.82% cover <br />1984 85.1 <br />1985 51.1 Based upon the USLE, 7.62% cover is <br /> insufficient to control excessive soil erosion. (1) <br />A 1979 23 <br />6 1 (x q) /n) <br />512 <br />= <br />9 ~ <br />488 <br />S <br />• <br />1980 . <br />26.2 ± <br />y <br />. <br />n, a . <br />. <br />. <br />1981 59.8 ~ y =.9(.512) ±(1.895)(.1889) <br />1982 68.4 ~ <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 5J87 Retyped 5196] <br />• <br />4-108 <br />Revision: T~' - 7 I <br />Approved: 2~~~4E <br />