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Appendix A - Vegetation Sampling for Phase III Bond Release <br />• <br />reference area is rejected. The Irrigated Pasture Reclaimed Area mean exceeds 90% of the AVF <br />Reference Area mean, and reclamation is statistically evaluated as successful. <br />Analysis of the same production data collected on the Rangeland Reclaimed and Reference Areas but <br />using a sample size of 90 produced the following result: <br />Step 1: SE S°` - 261.899 + (.9 * 3.159)2 <br />- 90 90 <br />SE,, =1.732 <br />Step 2: d fs°` - 9.00 <br />(8.468 + 0.0081) <br />89 89 <br />df,°, = 94.50 <br />• <br />The t-table value [one-tailed t-test value at the 90% confidence level (0. 1), df-?94] = 1.291. <br />13.22 - (0.9 * 4.0056) <br />Step 3: t = <br />1.732 <br />t = 5.55 <br />• <br />Since 5.55 > 1.291, the null hypothesis of the reclaimed area being less than or equal to 90% of the <br />reference area is rejected. The Rangeland Reclaimed Area mean exceeds 90% of the Rangeland <br />Reference Area mean, and reclamation is statistically evaluated as successful. Because both tests, using a <br />sample size of 15 and 90, resulted in rejection of the null hypothesis, the reclamation of the rangeland <br />area production can be considered successful in 2005. <br />Production - 2006 <br />Determination of sample adequacy in the field was based on the "wet weights" of clipped vegetation and <br />verified based on "dry weights" (Table A-18). Sample adequacy, utilizing Equation 3, was not achieved <br />on any of the four sampling units after the collection of thirty, 0.5-square-meter quadrats. Determination <br />of revegetation success was then evaluated by comparing mean production between the reclaimed and <br />reference areas and by utilizing the reverse null hypthesis one-tailed west. <br />TABLE A-18. 0.5 SQUARE-METER PRODUCTION PLOTS SUMMARY OF <br />2006: SAMPLE ADEQUACY CALCULATIONS <br />2215 PoldenEagle PH3B0ND 2006 3-10-08.doc A-10