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:: <br />~~~= <br />of Revegetation Success on Coal Lands in the West". The sample adequacy <br />=~ formula used was: ' <br />_ = m . t2 S2 <br />_ <br />~.- p2 . <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 />- = <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 />_- 2 - ~_ 2 ~L <br />~ Sp <br />m = x x <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 />- A ~ 'jc INC. ,•.. <br />3 ^- --- <br />