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t _ Q —x <br />SX <br />Where: <br />x = Bond Release Block Sample Mean <br />Q = 90 % of Standard <br />S- = Standard error of mean [ s / -,fn- ] <br />S = Sample standard 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 (N) is greater than or <br />equal to 90% of the standard, stated as H, : IJ z Q. <br />If c t is less than or equal to the 1- tailed t table value for alpha error probability of .10, at (n -1) <br />degrees of freedom (infinite degrees of freedom may be used if n >30), then H, is not rejected, <br />and revegetation is deemed successful for the parameter tested. <br />(c) If the reclaimed area sample mean is greater than 90 percent of the standard, and sample <br />adequacy is not demonstrated using the formula in (a), success may be demonstrated by use <br />of the "reverse null' hypothesis. Under the reverse null approach, a one sided Nest with alpha <br />error probability of 0. 20, is used to demonstrate that the reclaimed area mean is greater than 90 <br />percent of the relevant success standard with 80 percent statistical confidence. The basic <br />assumption, or null hypothesis, is that the reclaimed area mean is less than or equal to 90 <br />percent of the standard. If the null hypothesis of equality is rejected by the test, then <br />reclamation is considered successful for the parameter tested. A minimum sample size of thirty <br />is required. The general form of the "reverse null' Nest is: <br />August 2013 PR -08 2.05.4(2)(e) - 48 <br />