Laserfiche WebLink
• requirement of 900 lbs. of air dry matter, an oven-dry to air-dry weight conversion factor <br />of 1.11, 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. A77 comparisons were made from original data as presented <br />in Appendices 10-2 through 10-7. The general statistical designs are presented as <br />follows. <br />Sample adequacy was determined using the following CM LRD formula: <br />n = 52 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 />• t = a two-tailed t value with n-1 degrees of freedom at 0.2 probability <br />d = desired detectable reduction; 10~e (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 />x x <br />t = A - C <br />s(xA - sC) / <br />where s(xA xC) = Sz/ nA + nC <br />P\\ <br />nA nC <br />and s2 = (nA-1) sA + (nC-1) sC <br />P <br />(nA-1) + (nC-1) <br />. where xA =affected area mean <br />xC =control area mean <br />t = two-tailed t-value <br />2 <br />sA = variance among affected area samples <br />13 <br />