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shrub density. <br />~mple Adequacy. Evaluation of sample adequacy for total vegetation cover, plant <br />cover (including lichens), plant, litter, and rock cover, total production, and <br />shrub density are presented in Table 12. The equation used for evaluating <br />sample adequacy is from the OS~~ guideline "A Statistical Evaluation of Revegeta- <br />tion on Coal Lands in the West"(Larson 1980) 'and is as follows: <br />t2sz <br />m=~ <br />Where <br />m= the minimum number of observation needed <br />t= a table value (t distribution) fora given level of confidence <br />~2= the variance estimate <br />D= the level of accuracy desired for the estimate of the mean <br />Adequate samples were obtained for all vegetation types in reference and <br />affected area for the total vegetation cover, plant cover, plant, litter, and <br />rock cover, total production, and shrub density. <br />• <br />29 <br />