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a ~ • <br />Memo to Brian Munson -2- Ju1u 14, 1981 <br />Aspen tree woody plant density <br />H reference area tree woody plant density pre-mine area tree woody <br />o plant density <br />H reference area tree woody plant density # pre-mine area tree woody <br />a plant density <br />t - 57.8 - 37.3 = 4.722 <br />32.3 32.3 <br />9 + 3 <br />t a(1), v=5,p=.05 - 2.015 <br />Conclude that the Aspen community woody plant density is not equivalent at 95% <br />confidence between reference areas and pre-mine areas. <br />Chokecherry cover <br />H reference area cover . pre-mine are~3 cover <br />0 <br />H reference area cover # pre-mine area cover <br />a <br />t - 73.7 - 66.0 = 3.04 <br />11.0211.02 <br />Y 3 <br />t a(1),v=5,p=.05 = 2.015 <br />Conclude that Chokecherry pre-mine cover is not equivalent to Chokecherry reference <br />area cover at 95~ confidence. However, since reference area cover is greater, <br />the operator may accept the higher reference area standard if desired. <br />Chokecherry woody plant density <br />N chokecherry reference area woody plant density = chokecherry pre- <br />o mine woody plant density <br />H chokecherry reference area woody plant density # chokecherry pre- <br />a mine woody plant density <br />t _ 173.3 - 147.0 = 8.50 <br />16.4 16.4 <br />4 + 3 <br />t a(11,v=S,p=.05 - 2.015 <br />Conclude that pre-mine density is not equivalent to reference area density at <br />95~ confidence. Since the reference area density is higher the operator may <br />select to commit to the reference area standard. <br />/mt <br />