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<br />;<: ~>. <br />Ho :population mean (mu) Z 0.9 C <br />Ha :population mean (mu) < 0.9 C <br />where: C= the revegetation cover standard of 70% live aerial vegetation cover <br />The test statistic to be employed is the one-tailed t-test (Zar, 1974). The equation for <br />the test is as follows: <br />t = Xym; C <br />where: Sx = S/sgrt[n] <br />Sx <br />where: -mar= the sample mean <br />C =the cover standard <br />Sx =the standard error of the mean <br />n =the number of samples taken <br />The values for the revegetation cover sampling in 1992 (Hayes, 1992) are: <br />Xbaz= 61.2 <br />C = 0.9x(70.0) <br />Sx = 2.42 <br />n = 17 <br />The t test equation with the sample cover data becomes: <br />t = [61.2-(0.9)x(70)]/2.42 <br />t = 0.744 <br />The critical value of the t statistic for 90% confidence, one-tailed test, with 16 degrees <br />of freedom is 1.337. Since the calculated t value is less than the critical value, the <br />original hypothesis (I-Io :population mean (mu) > 0.9 C) is not rejected. The <br />statistical conclusion is that the areas sampled meet the revegetation success criterion <br />for cover. These areas have live aerial vegetation cover greater or equal to 90 % of the <br />70 % aerial vegetation cover with 90 % statistical confidence. <br />The statistical evaluation for the Meeker Area Mines for live aerial vegetation cover for <br />the five areas samples demonstrates that these areas meet the revegetadon success <br />criteria for vegetation Dover for Phase II bond release. <br />3 <br />