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Noxious Species Absolute Cover; 1998/1999 <br /> Beltline Reference Area#4 <br /> 1998 Data <br /> Sample mean......................41% <br /> True mean..........................28.3<U<53.7;95%C.I. <br /> 1999 Data <br /> Sample mean......................1.0% <br /> True mean..........................0<U<12.7;95%C.I. <br /> Absolute cover of thistle species decreased between years,and the decrease was statistically significant at <br /> the 95%confidence level(alpha=.05;2 tail, 1dj). <br />