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i <br />iI <br />I <br />i <br /> <br />5. 1979 ALKALI SAGEBRUSH PRODUCTION <br />The t-test should not be performed <br />obtained from the reference area. <br />i <br />since an adequate sample has not been <br />to <br />6. 1979 BIG SAGEBRUSH PRODUCTION . <br />'The t-test comparison should not be made since'an adequate sample was not <br />obtained from the permit area. <br />7. 1980 BIG SAGEBRUSH PRODUCTION <br />The applicant has utilized tl~e wrong critical t value which has affected the <br />outcome. A critical t of 2.012 (d.f. = 47, (2), p=.05) should have been <br />utilized. The permit and reference areas are not equivalent at the 95% level. <br />8. 1980 ALKALI SAGEBRUSH PRODUCTION <br />The t-test cannot be legitimately performed since adequate samples were'not <br />obtained from permit or reference areas. <br />9. 1980 BIG SAGEBRUSH WOODY PLANT DENSITY <br />The t-test comparison cannot be performed since adequate samples were not <br />obtained for permit or reference areas, <br />10. 1980 ALKALI SAGEBRUSH WOODY PLANT DENSITY <br />The t-test comparison cacinot be performed since adequate samples were not. <br />obtained for permit or reference areas, <br />4.15.T(4)(b) <br />Wyoming Fuel has misstated the null hypothesis for the t-test that will be <br />applied if reclaimed area mean values are less than weighted reference area mean <br />values. The null hypothesis should read: <br />H,,,: reclaimed area R (given parameter) = reference area x (given parameter). <br />If this hypothesis is accepted at the appropriate confidence level (90% herbaceous, <br />80% woody) then reclamation is considered successful. Wyoming fuel has not <br />addressed to success standards for woody plant density. <br />4.15.8 Revegetation: Success Criteria <br />,. .. The range of Shannon-Weaver Index values proposed to evaluate plant community <br />density do_not assure a diverse cover. The applicant has the option of leaving <br />open the diversity index question at this time, in which case a proper method of <br />utilizing diversity indices will be determined by the Division; or propose more <br />stringent success criteria for post-mining plant community diversity, <br />.~ ,: <br />