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• Grid cell size was 200 feet X 200 feet. These grid cells were placed contiguously <br />by hand on maps of 1:4,800 scale. Sample locations were selected as the center <br />points of grid cells selected using random numbers generated by computer. . <br />Sample points were located in the field using topographic maps. Cover and <br />woody plant density transacts were located and oriented using a blind throw of a <br />meter stick. The final location of each herbaceous production plot was chosen <br />randomly, associated with each cover/woody plant density transact. At each <br />cover/woody plant density sampling location, the slope (percent) and aspect of <br />the site (in degrees not corrected for magnetic declination) were determined and <br />recorded, as was the orientation of the transact (in degrees not corrected for <br />magnetic declination). <br />SAMPLE ADEQUACY CALCULATIONS <br />Sample adequacy calculations for parameter estimation without hypothesis <br />testing were carried out using the formula as prescribed by the Colorado Mined <br />Land Reclamation Board for parameter estimation without hypothesis testing <br />(DMG 1995): <br />tae s2 <br />Nmin= --"------- <br />(d X )2 <br />where: <br />to =one-tailed t-value with (n-1) degrees of freedom, a=0.10 <br />s2 =sample variance <br />d = 0.1 (0.15 for woody plant density) (level of precision or desired detectable <br />reduction) <br />• x = sample mean <br />CONFIDENCE LIMITS <br />