Laserfiche WebLink
• The null hypothesis being tested is that the mean value at the reclaimed site is less than <br />or equal to Q, with 80% statistical confidence. If t is greater than the 1- tailed t table <br />value for alpha error probability of 0.20, at n -1 degrees of freedom (infinite degrees of <br />freedom may be used if n > 30), then the null hypothesis is rejected, and revegetation <br />is deemed successful for the parameter in question. <br />4) If sample adequacy is not achieved in the reference area (regardless of whether <br />sample adequacy is achieved in the reclaimed area), success will be demonstrated by use <br />of the two - sample "reverse null" t -test with Satterthwaite approximation of standard error <br />and degrees of freedom. The test can be used if the following 2 conditions are met: 1) <br />a minimum of 30 sample observations are taken in the reclaimed area and also in the <br />reference area, and 2) the reclaimed area sample mean is greater than Q. <br />To use this test, first the Satterthwaite standard error is calculated as <br />b <br />((. <br />E <br />Where: <br />SE = Satterthwaite- approximated Standard Error <br />sb = bond release site (reclaimed site) sample standard deviation <br />• s fef = reference ar sample standard deviation <br />n = bond release site (reclaimed site) sample size <br />n fef = reference area sample size <br />Next, the Satterthwaite degrees of freedom are calculated as <br />0 <br />�( SF i <br />Where: <br />df = Satterthwaite- approximated degrees of freedom <br />Lastly, a one -sided reverse -null t -test with alpha = 0.20 is used as follows: <br />mj <br />t= <br />�Sen <br />Where: <br />• <br />REVISED 11 Nov 09 Tab 22 -29 <br />