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• These calculations for variances 2 <br />(s ) and percent reliability <br />are shown in Table 13. <br />An Example ~ <br />Calculations for cluster 22 for aspen follows: <br />Ex2 = 14160 <br />(Ex2)/n = 13987.6 <br />s2 = 172.4/9 or 19.2 <br />and <br />(100) xl - z2 = 0.88 (2) 19.2/10 - 4.6z <br />37.4 <br />Sample Adequacy <br />Sample adequacy was checked by calculating sample variances and t-tests <br />• every night during the vegetation sampling program. No sample adequacy cal- <br />culation ear se was ever done. An HP-67 with pre-programmed magnetic cards <br />makes this kind of check fairly routine. Plots were clipped in each vege- <br />tation type until the required confidence intervals were obtained. The <br />statistical analyses shown in this report are a de facto demonstration of <br />sample adequacy. <br />Environmental Factors <br />The communities of the permit area occur mainly as an expression of depth <br />to bedrock. Aspen is dominant in the deepest, sandstone-derived soil. Sage- <br />brush occurs on moderately deep to deep soils and less-steep slopes while <br />mountain brush is found on the lithic (shallow) soils. Slope and soil texture <br />exert a secondary influence with some specific expression. Kentucky bluegrass <br />• as a dominant understory grass was probably established as a result of seed <br />carried in by grazing sheep; although it is an exotic species, it is obviously <br />a-sl zz.s-2o <br />