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Table 12. Evaluation of sample adequacy for vegetation cover, plant cover, plant, <br />litter and rock cover, total production and shrub density. Based on <br />sample adequacy equation presented in text. <br />Sample Standard Adequate <br />Size !lean ±Deviation Sample Size* <br />TOTAL VEGETATION COVER (%) <br />Affected Areas t~ <br />Grassland ~•~~ rc,`' 25 8.88 ± 1.67 9 9-S <br />Big Sagebrush ~., ~~'~~~~ 15 30.53 ±- 6.39 7 / <br />Reference Areas -;.~ s•S~'~' <br />Grassland ~ ~ ~i' 20 13.50 ± 2.74 11 !la'l- <br />Big Sagebrush ~ 15 31.40 ± 5.17 4 ~-S <br />PLANT COVER (%) <br />Affected Areas <br />Grassland 25 9.80 ± 3.07 26 <br />Big Sagebrush 15 31.40 ± 6.92 8 <br />Reference Areas <br />Grassland 20 25.85 ± 7.13 20 <br />Big Sagebrush 15 31.80 ± 4.77 4 <br />PLANT, LITTER, and ROCK (%) <br />Affected Areas <br />Grassland 25 13.08 4.07 26 <br />Big Sagebrush 15 ~ 71.20 ± 16.55 9 <br />Reference Areas <br />Grassland 20 34.55 ± 8.75 17 <br />Big Sagebrush 15 66.40 ~ 19.49 14 <br />TOTAL PRODUCTION (g/m2) <br />Affected Areas ~ <br />Grassland ~~ ,~;~;ti'35 14.22 ± 4.67 29 ~ 2.°1-S`~ <br />Big Sagebrush ~ ~ ~:%M~;~' ~ 25 105.88 ± 31.92 16 ~~•9y- <br />Reference Areas ,~/~ ,~ , `' <br />Grassland~~%~"`•~ ~ 24 20.42 ± 5.40 19 ~9•`lt <br />Big Sagebrush ~ 30 103.54 27.89 12 c-•9 ti / <br />SHRUB DENSITY <br />(no. individuals/20m2) <br />Affected Area <br />Big Sagebrush 15 90.93 23.44 11 to.9Z ~ ,~ <br />Reference Area /~` ~~ <br />Big Sagebrush 15 95.73 23.31 10 t.~'Ir ~/ <br />*90% statistical confidence for grasslands and 80% statistical confidence for shrublands. <br />