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cover /woody plant density sampling location, the slope, expressed as a percent, and aspect of <br />the site, in degrees not corrected for magnetic declination, were determined and recorded, as <br />was the orientation of the transect. <br />Assessment of Reclamation Adequacy <br />GENERAL <br />Formal (statistical) hypothesis testing (see below) was undertaken for the Phase II Bond Release <br />Block (post -law, Permanent program lands) <br />SAMPLE ADEQUACY DETERMINATION <br />Sample adequacy calculations for parameter estimation were carried out using the formula as <br />prescribed by the Colorado Mined Land Reclamation Board for parameter estimation without <br />hypothesis testing (DMG 1995): <br />t 2 s2 <br />Nmin= <br />(d x )2 <br />where <br />to = one - tailed t -value with (n -1) degrees of freedom, a =0 10 <br />s2 = sample variance <br />d = 0 1 (0 15 for woody plant) (level of precision or desired detectable reduction) <br />x = sample mean <br />Confidence Limits <br />Confidence limits for comparisons to reference areas and technical standards were calculated <br />using a 1- tailed t -value for alpha error probability of 0 10 at (n -1) degrees of freedom multiplied by <br />the standard error of the mean of the sampled area <br />C.I. =tt I s <br />Lin <br />4 <br />