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• <br /> <br />annuals, with grasses contributing 131 lbs./acre and forbs providing 10 lbs./acre. Noxious weeds were <br />not found in any of the sampling quadrats in this community. <br />Perusal of Tables V12 and Chart V4 indicates that the estimated woody plant density in this area <br />was 19,376 woody plants per acre. The shrub lifeform accounts for 84% of the total (16,279 plants per <br />acre) with the remaining 16% attributed to sub-trees (3,097 per acre). Mountain snowberry was the <br />dominant woody species with 11,101 plants per acre followed by mountain big sagebrush, Gambel oak, <br />and serviceberry at 3,097, 3,144, and 1,433 plants per acre, respectively. <br />3.5.3 Study Area - Reference Area Comparability <br />Review of Table V2 indicates that the total vegetation ground cover and production for the Mountain <br />Shrub baseline study area is comparable to the values obtained from the Mountain Shrub reference area. <br />These comparisons of the "tabular" versus "calculated" t-statistics on Table V2 also indicate success <br />given the Students t-test indicated by the guidelines. A two-sided t-test for two independent samples <br />was considered appropriate and the decision rules for this test were: <br />If t* ? t(0.95,n1+n2-2) , conclude that the two areas are unequal, and <br />If t* < tt(O.95,n1+n2-2), conclude that the two areas are equal (for a = 0.05). <br />The tabular t values for an a = 0.05 and n-2 degrees of freedom (d.f.) and calculation of the <br />comparison t* statistic for comparison are as follows: <br />Variable tabular t value t* statistic <br />Vegetation Cover 1.9966 1.0681 <br />Production 1.9879 1.7256 <br />Comparison of the calculated t-statistic (t*) for the two areas with the respective tabular tvalues <br />indicates that in each case t* is less than t This results in the conclusion that the total vegetation <br />ground cover and production for the Mountain Shrub baseline study area is comparable (equal) to the <br />values obtained from the Mountain Shrub reference area. <br />3.6 Sagebrush Community <br />This community type comprises 5,699.6 acres (41.89%) of the vegetation study area as indicated on <br />Map V1. The sagebrush community is principally found at lower elevations occupying the relatively flat <br />CIEIIDAMCREEK AMOCIL S, INC. Page 28 2005 Collom Vegetation Survey