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t = calculated t -value <br />X = bond release site (reclaimed site) sample mean <br />X, = reference area sample mean <br />The null hypothesis being tested is that the mean value for the reclaimed site is less than <br />or equal to Q. If the calculated t value is greater than the table t value (alpha = 0.20, <br />df sat ), then the null hypothesis is rejected and revegetation is deemed successful for the <br />parameter in question. <br />REVISED 11 Nov 09 Tab 22 -30 <br />