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Table 21. Sample characteristics and adequacy requirements, Coal Basin Mines 11979-1980). <br /> Cover Ixl Production I9/m21 Shrub Density Tree Density Affected/Reference <br /> Ino./m21 (no./hat Area Comparability# <br /> Vegetation Type mean 52 n nmin mean s2 n nmin mean s2 n nmin mean s2 n nmin Cover Production <br /> Aspen Woodland <br /> Affected 88.3 32.3 20 >17 1� 67.9 922.7 25 15 1.0 0.5 41 40 1,591 141 40 40 2.7<5.5 2.9<14.9 <br /> Reference 91.0 66.4 15 65.0 353.4 20 16 0.7 0.1 15 9 2,381 366 25 23 <br /> Aspen Shrubland <br /> Affected 86.3 34.9 20 X'14 67.9 1,564.6 24 24 2.7 5.6 35 35 919 24 25 25 4.4<4.6 36.5>23.9 <br /> Reference 92.7 53.1 15 y(/o�104.4 1,517.0 20 10 3.0 1.2 15 10 t257 - - - <br /> Spruce/Fir Parkland <br /> Affected 68.8 110.2 20 X30 56.9 1,747,1 60 39 3.2 3.2 25 22 *430 77 4 2 0.2<7.0 46.8>19.7 <br /> Reference 69.0 97.1 15 VID103.7 1,385.9 20 10 1.7 0.5 15 12 t128 - - - <br /> s2 = varlance <br /> n = number of samples taken <br /> nmin = minimum number of samples needed for statistical adequacy <br /> #comparable If left number less than right number <br /> tdenslty based on total count - calculation of minimum sample size Irrelevant <br /> *density calculated with two-stage variance <br />