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Section 816-I 16(a) -continued <br />Reference Area Location <br />The reference area is located on Maps I S and i 6. <br />[hods For EstalzlishiRe_Refereace Areas and Performance Standar <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 />as: Ho: u, . u, = 0. <br />In this test. a "t" 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. If 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 />t = XI - X2 <br />s i n~ + n, <br />r <br />n~ nz <br />