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Edna Mine Vegetation Final Bond Release Monitoring 2005-2006 <br />each vegetation parameter sampled. The standard population sample adequacy <br />formula will be used to determine when an adequate sample has been collected: <br />rzsz <br />Nm~~ _ (df~~~ <br />Where: <br />Nm;,, =the minimum number of sample points needed in a given vegetation <br />type <br />z x; - ~ x;1 ~n <br />S =sample variance S = <br />n-1 <br />d =Precision (0.10 by regulation) <br />N =sample mean for the given vegetation parameter <br />t =The t-table value for a single tailed t-test with (n-1) degrees of freedom <br />Vegetation parameter sample populations will satisfy both minimum size <br />requirements and population adequacy, or meet maximum sample population <br />requirements. The minimum parameter population size will be 15 samples, the <br />maximum sample size will be 40 samples, at which point the central limit theorem <br />will be applied and the population sample mean will be considered representative <br />of an adequate population. <br />STATISTICAL TESTING: FINAL VEGETATION BOND RELEASE <br />Approved direct comparisons or appropriate statistical testing will be performed <br />as described in the Division of Minerals and Geology's Guideline Regarding <br />Selected Coal Mine Bond Release Issues, April 18, 1995 ("Bond Release <br />Guideline"). When the reclaimed area parameter sample mean is equal to or <br />greater than 90% of the reference area sample mean (or weighted mean), or <br />90% of the approved technical standard, reclaimed vegetation will be considered <br />Habitat Management, Inc. 15 3/23/2006 <br />