Laserfiche WebLink
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 />c <br />Where: <br />x = Bond Release Block 1 Sample Mean <br />Q = 90% of Standard <br />S = Standard error of mean [ s / AFn ] <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 />