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Noxious Species Absolute Cover; 1998 and 1999 <br /> Sutey Reference Area#2 <br /> 1998 Data <br /> Sample mean...............14.6% <br /> True mean...................9.8<U<19.4; 95%C.I. <br /> 1999 Data <br /> Sample mean................5.6% <br /> True mean....................3.6<U<7.6;95%C.I. <br /> Absolute cover of noxious species decreased between years,and the difference was statistically significant <br /> at the 95%level of statistical confidence(alpha=.05;2 tail, 9dj). <br />