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Hypothesis Testing - "Background" Density <br />Use of a reverse -null t -test of the assertion that the 2010 BRB PSCM -1 Background woody plant density <br />exceeds 90% of the standard is shown as follows: <br />F— (0.9 * technical standard) <br />t, _ <br />( <br />t _ 805.3- 180 -2.44 <br />1404.3 <br />Since critical t = 0.854 (one - tailed, alpha = 0.2, 29 df) and t is greater than this critical value, a <br />hypothesis of no difference is rejected and reclamation success for Phase Ill background shrub density in <br />2010 is demonstrated. <br />Hypothesis Testing - Concentration Area Density <br />Use of a reverse -null t -test of the assertion that the 2010 BRB PSCM -1 Concentration Area woody plant <br />density exceeds 90% of the standard is shown as follows: <br />x — (0.9 * technical standard) <br />t _ <br />(•171, <br />2092.2 —1800 <br />t = — 148 <br />( 1400.2\ <br />Since critical t = 0.849 (one - tailed, alpha = 0.2, 49 df) and t is greater than this critical value, a <br />hypothesis of no difference is rejected and reclamation success for Phase Ill shrub concentration area <br />density in 2010 is demonstrated. Also note that the shrub concentration area in which adequate density <br />has been demonstrated occupies over 22 percent of BRB PSCM -1, well exceeding the minimum <br />requirement of 5 percent. <br />22 <br />