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Beltline Reference Area #3 <br />Noxious Weed Density Sample Mean; 1998.2001 <br />1998 1999 2000 2001 <br />Thistles per sq. meter 10.7 7.3 0.6 0.5 <br />Ox-eye daisy per sq. meter 1.1 1.3 <br />Noxious Combined per sq. meter 8.4 1.9 <br />From 1998 to 2001, thistle density sample mean declined by <br />approximately 95%. True mean declined by at least 85%, at the <br />95% confidence level. <br />From 1999 to 2001, ox-eye daisy sample mean was stable; <br />combined noxious sample mean declined sharply due to decrease <br />in thistle density. <br />Figure 6 -Beltline Reference Area #3 <br />Noxious Species Densities <br />m :: 15 - <br />a ~ ~~ ! +ThisUes per sq. i <br />a m ~ meter <br />> > 5 ~ ~ ,~ i -~- Ox•eye daisy <br />Z u~ ~ - per sq. meter <br />1596 1;.•99 2~OS 2u~ . <br />TABLE 12 <br />