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• planned for disturbance. The statistical formula used to make this <br />comparison was: <br />E(zl-x )Z+E(zi-x )Z 1 1 (10) <br />V- SID- V (-) + ( ~~ ) <br />n~+n~~-2 n n <br />where <br />X <br />1 = study area cover, production or density value at 1 sample point <br />x = study area sample mean of production, cover density <br />// <br />Xi = reference area cover, production or density value at 1 sample <br />point <br />X = reference area sample mean of production, cover or density <br />II = study area number of production, cover or density points <br />nii = reference area number of production, cover or density points <br />V = pooled estimate of variance <br />• SID = standard error of difference of the means <br />t_ (~-x ) (11) <br />SID <br />where <br />t = calculated t value for comparison with observed t values (from <br />Table 26 - Cook and Bonham) at n + n -2 degrees of freedom and <br />two tailed test. Calculated t values less than the observed <br />t indicate no statistical significant difference between the <br />two means. <br />Cover <br />V- 954 .8+374 .8 _83 .1 <br />(11+7)-2 <br />SED-~I 83.1 ( it + ~) -4 .40 <br />V <br />NCEC - Coal Ridge #1 3-73 ABC/1145/900301 <br />