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• Sample Adequacy <br />Table 26 compiles calculation of sample adequacy for the various data sets collected <br />during the 2002 monitoring. The two areas in which sample adequacy was specifically <br />sought during 2002 sampling were the cover data collection in each of the reference <br />areas. In both of the latter cases, sample adequacy was achieved. Sample sizes used <br />in the reclamation areas were selected with reference to the general size of the sample <br />areas, As can be seen in Table 26, the cover data sample size'accomplished sample <br />adequacy much of the time. Likewise, as is often the case, a reasonable sample size <br />was adequate or close to adequate for the production samples taken. As usual, for <br />woody plant density, the minimum adequate sample sizes were very large. At such time <br />as bond release is formally pursued, it will be necessary to conduct statistically adequate <br />sampling of woody plant density. At this time, the use of a basic sample size of thirty <br />with adequacy calculated based on the variance of the running mean would be <br />suggested (see Clark 2001), This technique is in the process of review and approval by <br />state and federal regulatory agencies. <br /> <br />LITERATURE CITED <br />Clark, David L. 2001. "Stabilization of the mean as a demonstration of sample <br />adequacy". Paper presented to 2001 National Meeting of the American Society <br />for Surface Mining and Reclamation. Albuquerque, NM. Published by ASSMR, <br />3134 Montavesta Rd., Lexington, KY 40502. <br />Rohlf, J.F. and R.R. Sokal. 1969. Statistical Tables. W.H. Freeman and Company, San <br />Francisco. <br />Weber, W, A. and R. C. Wittmann. 1992. Catalog of the Colorado Flora: A Biodiversity <br />Baseline. Univ. of Colo. Press, Boulder. 215 p. <br />