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Seneca 11 Mine <br />SL -6 Phase Ill Bond Release Request <br />June 2014 <br />As stated earlier, weight averaging results in the loss of a reliable estimate of sample variance. <br />Therefore a two- sample t -test was completed against each reference area using the logic that if <br />the 2012 Phase III BRB -5 production data passes against each reference area individually, the <br />reclaimed area would thus pass the weighted herbaceous production performance standard. <br />A two- sample t -test of Reverse Null Hypothesis with Satterthwaite's Adjustment of the assertion <br />that the 2012 BRB -5 allowable herbaceous production is indistinguishable from Mountain Brush <br />Reference Area allowable herbaceous production is as follows: <br />x b,. — 0.9 xF,.F f <br />tca2c = — <br />Sbr + (0.9 : S"f)2 <br />11br 11 ref <br />_ 976.1— (0.9 x 214.5) = 7.608 <br />t`��` 808740.49 (0.81 * 19516.09) <br />35 + 31 <br />SEsa: <br />dfsa: = SEb,. + (0.9 * SErg f )a <br />Cnbr- 1 11 ref — 1 <br />2 2 <br />where: SE,,, <br />= J;Sb,. + 0.9 Sref <br />br nrgf <br />— r 808740.49 + (0.81 - 19516.09A — <br />f <br />df — 35 31 _ 27.85 or 28 <br />(161.5216 + (0.9 * 25.09)4 <br />V35 31 -1 <br />Since critical tc = 0.855 (one - tailed, alpha = 0.2, 28 dfJ and t,:,,, (7.608) is greater than this critical <br />value, , the hypothesis of less than or equal to 90% of the standard is rejected and reclamation <br />success for BRB -5 Phase III herbaceous production relative to the 2012 Mountain Brush <br />Reference area is demonstrated. <br />A two - sample t -test of Reverse Null Hypothesis with Satterthwaite's Adjustment of the assertion <br />that the 2012 BRB -5 allowable herbaceous production is indistinguishable from Sagebrush <br />Reference Area allowable herbaceous production is as follows: <br />14 <br />