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• <br />u <br />CJ <br />lorrncitD Canyon Mine ~ VcRetarion Techtica! ReDOrt <br />TABLE V-2 <br />LORENCITO CANYON MINE <br />GRASSLAND STATISTICAL AREA COMPARISON STUDENT t-TEST <br /> Reference Area Grassland Disturbed Area Grassland <br />Mean Basal Cover 27.27 28.80 <br />Sample Variance 7.90 5.48 <br />k of Sample Points 15 15 <br />Calculated [Table Value 1.62 <br />Student [Table Value 2.05 <br /> Null hypothesis i s accepted <br />Mean Shrub Densiry 2.40 1.50 <br />Sample Variance 0.72 0.27 <br />k of Sample Points 35 15 <br />Calculated t Table Value 3.79 <br />Student t Table Value 2.O1 <br /> Null hypothesis is rejected <br />Mean Production (grams) 9.83 6.87 <br />Sample Variance 1.99 1.23 <br />q of Sample Points 15 15 <br />Calculated t Table Value 6.39 <br />Student t Table Value 2.05 <br /> Null hypothesis is rejected <br />Grassland Reference Areas <br />Within the grassland reference areas sampled, dominant perennial grasses included blue grams and <br />narrow-leaf sedge at 8.27 and 4.8 percent cover, respectively. Common perennial forbs included <br />trailing fleabane and hairy goldaster. Annual grasses included cheatgrass. Annual forbs were <br />dominated by dandelion and black medic. Broom snakeweed dominated the woody stem density <br />count in this area. Litter comprised almost 50 percent of the entire transect cover. Rock <br />comprised a minimal amount of the overall cover, while bare ground covered about 16 percent of <br />the total cover. <br />Veg.475/ADril 23, 1997 <br />8 <br />(revised 4/21/97) <br />