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(d x )2 <br />n <br />U <br />where: <br />t( = 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 s- <br />[n] <br />• HYPOTHESIS TESTING FOR PHASE I I BOND RELEASE AREA <br />The hypothesis being tested here is that the allowable percent absolute (foliar) all hit herbaceous <br />vegetation cover of the Phase II Bond Release Area >_ 90% of the weighted allowable absolute <br />foliar all- hit herbaceous vegetation cover from the reference areas (weighted based on the <br />following extents of types in the Yoast pre-mining area to be disturbed as shown in the table <br />below). <br />Vegetation Type % of Pre-mine <br />Sagebrush/Snowberry 24.0 <br />Mountain Brush 48.9 <br />Aspen Woodland 24.4 <br />Steep Mountain Brush 2.7 <br />Alkali Sage./West. Whtgrs. 0.0 <br />These reference areas were sampled to adequacy to establish the standards for comparison <br />against reclaimed area values. If after 15 cover samples have been completed in Phase II Bond <br />Release Area, sample adequacy had been achieved and the reclamation area mean total <br />5