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tc=Q—x /Sx <br />Where: <br />x = Bond Release Block Sample Mean <br />Q = 90% of Standard <br />S x = Standard error of mean [ s / �n ] <br />S = Sample standard deviation <br />n = Sample size <br />t, = Calculated t value <br />tr = Table t value <br />The null hypothesis being tested is that the mean value at the reclaimed site is greater than or <br />equal to Q, with 90% statistical confidence. If tc is less than or equal to the 1 -tailed t table <br />value for alpha error probability of 0. 10, at n-1 degrees of freedom (infinite degrees of freedom <br />may be used if n > 30), then the null hypothesis is not rejected, and revegetation is deemed <br />successful. <br />3) If sample adequacy is not achieved at the reclaimed site, but is achieved at the reference <br />area, and the following 2 conditions are met: 1) a minimum of 30 samples were taken at the <br />reclaimed site, and 2) mean production at the reclaimed site is greater than Q, a "reverse null" <br />hypothesis will be tested using a one -sample one-sided t-test with alpha error probability of <br />0.20, in conformance with DRMS Regulation 4.15.11(2)(c). The following form of the t-test <br />will be used: <br />January 2015 TR -66 2.05.4(2)(e) - 32 <br />