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<br /> <br />2.5 Sample Adequacy Determination <br />Sampling within each unit (Phase III Bond Release Block or Sagebrush Reference Area) was conducted <br />to a minimum of 30 samples. From these preliminary efforts, sample means and standard deviations for <br />total non-overlapping vegetation ground cover, production, and woody plant density were calculated. The <br />Cochran formula (below) for determining sample adequacy was used to calculate nmin, whereby the <br />population is estimated to within 10% of the true mean (µ) with 90% confidence. <br />When the inequality (nmin ≤ n) is true, sampling is deemed adequate; and nmin is determined as <br />follows: <br /> nmin = (t 2s 2) / (0.1 x )2 <br /> <br /> <br />Where: n = the number of actual samples collected <br /> t = the value from the one-tailed t distribution for 90% confidence with n-1 <br /> degrees of freedom; <br /> s 2 = the variance of the estimate as calculated from the initial samples; <br /> x = the mean of the estimate as calculated from the initial samples. <br />If the initial samples do not provide a suitable estimate of the mean (i.e., the inequality is false), a <br />reverse null success evaluation which does not require adequacy would be employed (Rule 4.15.11 (2)(c)). <br />Sample adequacy results are presented on Tables 2, 9, 10, and 11. <br />CEDAR CREEK ASSOCIATES, Inc.10 Munger Canyon Mine - 2016 <br />Phase III Bond Release Report