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<br />1 <br />l~ <br /> <br />1 <br /> <br />1 <br />1 <br />1 <br />1 <br /> <br /> <br />1 <br /> <br /> <br /> <br />1 <br />Kent Gorham <br />June 15, 2000 <br />Page 4 <br />pastureland reclaimed azea will be considered successful if the sample mean is at least 90 percent <br />of the productivity sample mean measured on the AVF Reference Area. Ten transects will be <br />initially evaluated for success comparison and statistical evaluation purposes. The Snedecor- <br />Cochran sample adequacy formula (Equation 2) will be utilized to determine that an adequate <br />number of samples are collected. <br />Post Miuiug Success Demonstration <br />Post mining demonstration of revegetation success for vegetative cover and herbaceous production <br />within the reclaimed azeas will be determined through use of the One-Sample T-Test (Equation 3). <br />This statistical test is used only when the reclaimed area sample mean is less than 90 percent of the <br />reference azea mean value. <br />(3) <br />~ _ Q - X <br />c <br />S- <br />s <br />Where: <br />t~ = Calculated t value <br />Q = 90% of the standazd <br />z = Bond release block sample mean <br />s„ = Standazd error of the mean (s/dn) <br />s = Sample standard deviation <br />n = Sample size <br />The null hypothesis being tested is that the bond release block mean (u) is greater than or equal to <br />90%ofthe standazd (H°: u z Q). Ift~ is less than or equal to the 1-tailed t table value for alpha error <br />probability of .10, at the appropriate degrees of freedom, then H° is not rejected, and revegetation <br />is deemed successful for the parameter tested. <br />Species Diversity <br />The diversity ofplant species present in the reclaimed rangeland and Grassland Reference azeas will <br />be evaluated using data acquired from the 25-meter point-intercept transects. Data from the transects <br />will be analyzed by implementing Equatiou 4 to determine the relative cover of each species <br />detected. <br />