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C• <br /> <br />• <br />Table 19. Seneca II Mine Vegetation Productivity Adequate Sample Size <br />Calculation in the Absence o` Shrub Data* <br />UPLAND SAGEBRUSH - CONTROL <br />x = 36.9 <br />S = 16.9 <br />** <br />N <br />= 15 <br />N <br />min - 7 <br />MI}O;D BRUSH - COL~ITfd~L <br />x = 43.9 <br />S = 31.3 <br />N = 24 <br />N = 17 <br />min <br />UPLAND SAGEBRUSH AFFECPID <br />x = 53.6 <br />S = 31.3 <br />N = 24 <br />N = 12 <br />m~ <br />MIXED BRUSH <br />x = 50.3 <br />S = 30.6 <br />N = 56 <br />N <br />man = 10 <br />Sarple adequacy calculated by the follaaing formula (from [Vyoming <br />Department of Environmental Quality Gttideline #2, A7arch, 1979) <br />N = 2 (SZ) 2 <br />min (dx)2 <br />where: N~ = minicmmi sample size needed to achieve sample <br />adequacy at the 80~ confidence level <br />S = sample standard deviation <br />Z = 0.84 at the 80$ confidence level <br />d = 0.2 at tt~ 80o confidence level <br />x = sample mean <br />** <br />N = numb_r of samples actually taken <br />-67- <br />