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area standard thereafter in the process is treated as a technical standard (i.e. without confidence limits) <br /> and one-sample t-testing is used. <br /> HYPOTHESIS TESTING APPROACHES <br /> For formal hypothesis testing relative to Phase II Bond Release the following procedures were followed: <br /> Cover and Production <br /> Phase II Revegetation success for cover will be demonstrated by one of following statistical approaches. <br /> 1) If sample adequacy has been achieved (minimum of 15 samples) in the BRB and the reference <br /> area(s), and the reclaimed area mean allowable herbaceous cover is above 90% of the weighted <br /> reference area-derived standard, all criteria are met for a direct comparison and revegetation <br /> would be deemed successful (CDMG 2005 revised rule, 4.15.11 (2)(a)). <br /> 2) If the mean allowable herbaceous cover of the reclaimed area above 90% of the weighted <br /> reference area-derived standard, and sample adequacy was not met for the reference area(s) <br /> and/or BRB (minimum of 30 samples, technical standards not subject to sample adequacy), then <br /> the hypothesis of reclamation success would be tested using a parametric test of the "reverse" <br /> null hypothesis. This would be conducted using the following expression (CDMG 2005 revised <br /> rule, 4.15.11 (2)(c)): <br /> tc = x — Q <br /> S- <br /> a <br /> Where: <br /> t = Bond Release Block 1 Sample Mean <br /> Q = 90% of Standard <br /> S_ = Standard error of mean [s/Nln] <br /> S = Sample standard deviation <br /> n = Sample size <br /> tc = Calculated t value <br /> tt = Table t value (alpha = 0.2) <br /> The null hypothesis being tested would be that the bond release block mean (µ)was less than or equal to <br /> 90% of the standard, stated as Ho: µ<_ Q. If tc was greater than the 1-tailed t table value for alpha error <br /> 6 <br />