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31% sagebrush /snowberry, 13% steep mountain brush and 10% western wheat/alkali sagebrush). In the <br />process of weighting, a reliable estimate of variance is lost. Thus the reference area standard thereafter <br />in the process is treated as a technical standard (i.e. without confidence limits) and one - sample t- testing <br />is used. <br />HYPOTHESIS TESTING APPROACHES <br />For formal hypothesis testing relative to Phase II Bond Release the following procedures were followed: <br />Cover <br />Phase II Revegetation success for cover will be demonstrated by one of the following statistical <br />approaches. <br />If sample adequacy has been achieved (minimum of 15 samples) in BRB -2b and the reference areas, <br />and the reclaimed area mean total allowable herbaceous cover is above 90% of the reference area- <br />derived standard, all criteria are met for a direct comparison and revegetation would be deemed <br />successful for cover (CDMG 2005 revised rule, 4.15.11 (2)(a)). <br />Were the mean allowable herbaceous cover of the reclaimed area above 90% of the reference area- <br />derived standard, and sample adequacy was not met for the reference areas and /or BRB -2b (minimum of <br />30 samples, technical standards not subject to sample adequacy), then the hypothesis of reclamation <br />success would be tested using a parametric test of the "reverse null' hypothesis. This would be <br />conducted using the following expression (CDMG 2005 revised rule, 4.15.11 (2)(c)). <br />_z —Q <br />tc Sz <br />Where: <br />x = Bond Release Block Sample Mean <br />0 = 90% of Standard <br />S = Standard error of mean 1, i VW ] <br />X <br />s = Sample standard deviation <br />n = Sample size <br />t, = Calculated t value <br />tt = Table t value (alpha = 0.2) <br />