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Section 816-116(a) -continued <br />i Reference Area Location <br />The reference area is located on Maps I S and 16. <br />Methods for Establishing Reference Areas and Performance Standards <br />By September 30, 1980, a relationship between the range sites which will be disturbed by mining their <br />corresponding reference areas which will not be disturbed by mining, will be established. Relationships will be <br />established using the statistical "t" test in which the respective means for cover or production from the <br />undisturbed range site and reference area are compared. The test applied will be the null hypotheses (Ho) that <br />concludes that there is not a statistical difference between the two locations (u, and uZ); here expressed <br />In this test, a "[" value calculated from the sample data is compared to a "t" value from a "t" distribution table <br />for the appropriate sample size and confidence. [f the calculated "t" value is less than the tabular "t", then the <br />null hypothesis is accepted and the undisturbed range site and the reference area are considered one and the same. <br />A description of the formula is given as follows: <br />Calculated "t" for uneven sample sizes: <br /> <br />lI <br />S~ - S, <br />/ _ <br />ni + n, <br />s~- <br />ni rh <br />PR-0; 316-157(a) Revised 7/10/93 <br />