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(s) • <br />% Relative Cover of Species X = .'; Cover of Species X <br />Total Veg. Cover <br />The percent total vegetative cover for each of the areas is <br />the mean of the ten transects. Diversity will be calculated by <br />lumping the plants into groups of: cool season grasses, warm <br />season grasses, and fortis. Then comparing the number of species in <br />each group to the standard. <br />Production comparisons will be made by clipping six 0.1 mZ <br />plots located along each transect. The production plots will be <br />located along one side of the transect while woody plant density <br />belt transects will be located along r-he other side. Sample size <br />adequacy will be determined-by equation 1. <br />Data analysis will consist of comparing reclaimed area <br />production with reference area production. If this comparison <br />indicates production is insufficient, but close to the standard, a <br />statistical analysis will be conducted to determine if the <br />vegetation is statistically acceptable. The statistical methods <br />that will be used are described below. <br />Mean production for the proposed release area will be compared <br />to mean production for the reference area using a one-tailed <br />difference of the means test. The null hypothesis for the test <br />will be that production on the release areas is greater than or <br />equal to production on the reference area. The model of test <br />equation that will be used will depend upon whether the variances <br />of the two samples are equal or unequal. The variances will be <br />tested using equation 4. <br />(4) <br />gc~i~ = larder s~ <br />smaller s~ <br />The F~1i value to be compared with F~ai~ will be selected from <br />a standard table of critical values for the F-distribution. The <br />test will have ~ = 0.1. The degrees of freedom for the numerator <br />and denominator will each be equal to n-1. If F~,,< < F~,b,, then the <br />variances will be considered equal and model A of the difference of <br />the means test will be used. Otherwise, model B will be used. <br /> <br />2.05-51 (b) (revised 07/24/98) <br />