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RULE 2 - PERMITS <br />t 2 S 2 <br />nm (dx)z <br />• Where: l <br />nm = Minimum Reclaimed Area Sample Size <br />s = Sample variance (n -1 degrees of freedom) <br />d =Precision (0.10 for cover and production; 0.15 for woody plant density) <br />x = Sample arithmetic mean <br />t = The ((.10) t -table value for a 1 tail t -test, n -1 degrees of freedom (infinite degrees of <br />freedom may be used if n >30) <br />n = Sample size <br />If the mean all hit herbaceous cover or herbaceous production of an adequate sample from the <br />reclaimed area is less than 90 percent of the cover standard, then a one - sample t -test will be made in <br />the following form to test the hypothesis of reclamation success for cover (CDRMS Coal Section, <br />4.15.11 (2)(b)): <br />t =Q —x <br />S- <br />x <br />Where: <br />x = Reclaimed Area Sample Mean <br />• Q = 90 percent of (the weighted) Standard <br />SX = Standard error of mean [ s / -Fn ] <br />S = Sample standard deviation <br />n = Sample size <br />t, = Calculated t value <br />tt = Table t value <br />The null hypothesis being tested is that the reclaimed area mean (µ) is greater than or equal to 90 <br />percent of the standard, stated as Ho: µ ? Q. If t, is less than or equal to the one - tailed t table value <br />for alpha error probability of .10, at (n -1) degrees of freedom (infinite degrees of freedom may be <br />used if n >30), then Ho is not rejected, and revegetation is deemed successful for the parameter <br />tested. <br />If sample adequacy for all hit herbaceous cover or herbaceous production has not been achieved <br />after a minimum of 30 samples in the reclaimed area _and the means for all hit herbaceous foliar <br />cover or herbaceous production exceed 90 percent of the reference area- derived standard, then the <br />hypothesis of reclamation success will be tested under the conditions a "reverse null" approach <br />using a parameteretric test of the "reverse null" hypothesis. This would be conducted using the <br />following expression (CDRMS Coal Section, 4.15.11 (2)(c)): <br />x —Q <br />• SS <br />PSCM Permit App. 2.05 -50 Revision 12/17/09 <br />