Laserfiche WebLink
:: <br />~~~= <br />of Revegetation Success on Coal Lands in the West". The sample adequacy <br />=~ formula used was: <br />_ _ m = t2 S2 <br />_ D2 <br /> <br />= where • <br /> m = the minimum number of observations needed <br /> - t = table value of 1.28 for 80`6 level of confidence <br /> S2 = variance of initial sample <br />_ D2 = sample mean times level of accuracy (20X) <br /> The formula used to determine the level of similarity between the pre- <br />- - mine and reference area vegetation characteristics is called by O.S.M. <br /> as the t-test comparison which is written: <br />__ to = X~ - Xi <br /> <br />~ • SP -n' + ni <br /> ( nJni ) <br />= where <br />• = X = sample mean , <br />-= n = sample size <br />_- <br />Sp <br />2 - "~_ 2 ~L <br />m = x x <br />:~~ . <br />~ <br />nJ + nit <br />= n <br />_= Species diversity was calculated on herbaceous cover according to the <br />Shannon-Weiner Index as outlined in the Office of Surface Mining publi- <br />cation "The Concept of Species Diversity in the Evaluation of Revege- <br />tation Success". <br />.•.~ The equation: <br />::~ .. <br />H = Pi log Pi <br />- ~ {~c 'jc 12iC. <br />3 ^_ ^- <br />