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• If The mean herbaceour cover or production of an ~uate rampk firm BI{B-3 zr krr than 90% of the rover <br />standard (see above), then crone-rampk t-test Hall be made in the following fornt to tent the hypotherir of reclamation <br />rXCCCJJ for cover (CDMG Coa! Bukr, 4.15.11 (2)(bJ): <br />_Q-x <br />t° S- <br />x <br />Where: <br />x =Bond Release Block Sample Mean <br />Q = 90% of Standazd <br />Ss = Standazd error of mean [s / ~] <br />S =Sample standazd deviation <br />n =Sample size <br />t< = Calculated t value <br />k = Table t value <br />The null hypothesis being tested is that the bond release block mean (µ) is greater than or equal to <br />90% of the standard, stated as Ii°: µ >_ Q. If t< is less than or equal to the 1-tailed t table value for <br />alpha error probability of .10, at (n-1) degrees of freedom (infinite degrees of freedom may be used if <br />n>30), then FIo is not rejected, and revegetation is deemed successful for the parameter tested. <br />IF Sample adequacy for herbaceous rover orproduction lwr not been achieved in BRB-3 and a total of 30 or mote <br />• sampler have been taken, and the means for total herbaceous foliar cover or herbaceous production in the BAB <br />reclaimed area exceed 90% of the rxference area-derived standard} then the hypothesis of reclamation success will be <br />tested under the cond:7ions a `ieverre null" approach using a parametric test of the "reverse null" hypothesis. This <br />would be conducted using the following expression (CDMG Coal Auks, 4.15.11 (2)(c)J: <br />_xxQ <br />t° S- <br />x <br />Where: <br />x = Bord Release Block Sample Mean <br />Q = 90% of Standazd ~ <br />S- = Standazd error of mean [ S l y n ) <br />S =Sample standazd deviation <br />n =Sample size <br />t< = Calculated t value <br />t, = Table t value <br />The null hypothesis being tested is that the bond release block mean (µ) is less than or equal to 90% <br />of the standazd, stated as I3°:µ < Q. If 4 is greater than the 1-tailed t table value for alpha eaor <br />probability of .20, with (n-1) degrees of freedom (infmite degrees of freedom may be used ff n>30), <br />then Ho is rejected, and revegetation is deemed successful. <br />For the above (one-sample) t-test, it will be necessary to have achieved sample adequary in the <br />• reference area sampling. Were adequary NOT to have been achieved in the reference azeas, then the <br />more complex calculations associated with a two-sample t-test (CDMG 2003 proposed rules <br />revisions) would be undertaken. <br />ESCOA.rsociater 13-13-7 TA~40 *03/06 <br />