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t — Q —x <br />S <br />Where: <br />x = Bond Release Block Sample Mean <br />Q = 90 % of Standard <br />S- = Standard error of mean [ s / N Fn ] <br />S = Sample standard deviation <br />n = Sample size <br />t, = Calculated t value <br />t = Table t value <br />The null hypothesis being tested is that the mean value at the reclaimed site is greater <br />than or equal to Q, with 90% statistical confidence. If t, is less than or equal to the 1- <br />tailed t table value for alpha error probability of 0.10, at n -1 degrees of freedom (infinite <br />degrees of freedom may be used if n > 30), then the null hypothesis is not rejected, and <br />revegetation is deemed successful. <br />3) If sample adequacy is not achieved at the reclaimed site, but is achieved at the <br />reference area, and the following 2 conditions are met: 1) a minimum of 30 samples were <br />taken at the reclaimed site, and 2) mean production at the reclaimed site is greater than <br />Q, a "reverse null" hypothesis will be tested using a one - sample one -sided t -test with <br />alpha error probability of 0.20, in conformance with DRMS Regulation 4.15.11(2)(c). The <br />following form of the t -test will be used : <br />t = — Q <br />S <br />Where: <br />x = Bond Release Block Sample Mean <br />Q = 90% of Standard <br />S_ = Standard error of mean [ s / v f n ] <br />X <br />S = Sample standard deviation <br />n = Sample size <br />t = Calculated t value <br />t = Table t value <br />REVISED 11 Nov 09 Tab 22 -29 <br />