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• Gambel oak, serviceberry and snowberry cover extensive <br />portions of the strip mine study area and big sagebrush and <br />_ mountain mahogany occur frequently on the underground portal <br />study area. <br />I-3.10 Rare, Endangered and Threatened Species <br />No rare, endangered or threatened plant species listed <br />by the Plant Information Network, Fort Collins, Colorado, <br />1979 were located on or near the study area. Special surveys <br />- were undertaken during spring, mid- and late summer. <br />I-3.11 Study Area and Reference Area Statistical Comparison <br />A one-tailed t-test for the mountain shrub and <br />pinyon-juniper types was performed to compare the homogeneity <br />- of study area and reference area plant communities. Cover, <br />production and density were each tested at the 95~ level <br />of significance (p = 0.05) and the calculated t value was <br />_ compared to the t value at infinity degrees of freedom <br />- provided from Table III of Fisher and Yates: Statistical <br />Tables for Biological, Agricultural and Medical Research. <br />The calculated t values on both vegetation types for <br />tree and sh-ub density and production in the pinyon-juniper <br />type were less than the observed t value (Table 17) indicating <br />- no real statistical significance between the differences <br /> <br />- 40 - <br />