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/~ <br />requirement of 900 lbs. of air dry matter, an oven-dry to air-dry weight conversion factor <br />of 7,17, and an overall proper use factor of 50 percent were used in this calculation. <br />General Statistical Design. Since the original baseline presentation is a composite of <br />several years of data collection by different consulting firms (ERT, 1979, 1980, 1982 and <br />WRDC, 1983), a comparison of the results required converting all data to uniform units and <br />data analysis was standardized. All comparisons were made from original data as presented <br />in Appendices 10-T through 10-7. The general statistical designs are presented as <br />follows. <br />Sample adequacy was determined using the following CMLRD formula: <br />n = S2 t2 <br />min 2 2 <br />d x <br />where n = the minimum required sample size <br />2min <br />s = sample variance (n-1) <br /> <br />t = a two-tailed t value with n-1 degrees of freedom at 0.2 probability <br />d = desired detectable reduction; 10"s (d = 0.1) <br />x = arithmetic mean <br />The comparability of affected and reference areas was calculated using the formula <br />recommended by CMLRD: <br />t = xA - xC <br />s(xA - sC) / <br />where s(xA xC) = SZ/ nA + nC <br />P <br />nA nC <br />2 <br />and sP = (nA-7) sA + (nC 1) sC <br />(nA I) + (nC-7) <br />where xA =affected area mean <br />xC = control area mean <br />t = two-tailed t-valuc <br />2 <br />sA = variance among affected area samples <br />