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inrcsnouncain.Noi�, <br /> • 4 <br /> Sample Adequacy. For each vegetation characteristic measured, statistical <br /> sample adequacy was calculated as shown below: <br /> N 2t2s2 <br /> min. _ <br /> (0.1�2 <br /> where Nmin. = minimum number of samples required to detect a ten <br /> percent change in the mean at a given level of <br /> confidence <br /> t = value of double-tail "t" for the degrees of freedom and <br /> desired level of confidence <br /> s = standard deviation of the sample population <br /> x = sample mean <br /> An exception to the sample adequacy requirement was made in the case of <br /> . the aspen vegetation type for the Sutey property. This type has already <br /> been extensively sampled and described in previous baseline inventory work <br /> at the Coal Basin Mine. Therefore, the Division has required only five <br /> production samples and ten cover and woody plant density samples, in lieu of <br /> the normal sample adequacy requirement. <br /> Reference Area. Shortly after the field work for the vegetation inventory <br /> was completed, negotiations between Mid-Continent Resources, Inc. and the <br /> Division resulted in the need to establish a reference for the meadow <br /> vegetation type. The reference area selected is shown on the vegetation <br /> map, and comprises about 2 acres. Reference area boundaries have been <br /> marked in the field with metal posts and colored flagging. The reference <br /> area was sampled for vegetation cover and herbaceous production in <br /> mid-September, 1984. Sampling methods were the same as described <br /> • <br />