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The t~,b,e value to be compared with t_e,: will be selected i`rom a • <br />standard table of critical values for the Stud.ent's t-distribution. <br />The test will be one-tailed with « = O.i and degrees of freedom = <br />nl+nz - 2 . <br />In model B of the differehce of ttie means test, t~a,~ is <br />determined using equation 6. <br />(6) <br />zl - xz <br />t~d~ _ <br />z z <br />sl sz <br />n~- 1 n z- 1 <br />where: <br />x = release area mean crop productior_, <br />zz = reference area mean crop production, <br />s;' = release area sample variance, <br />5~2 = reference area Sample L"aria:iCe, <br />n; = release dre3 sample size, and <br />n, = reference area sample size. <br />The t_,bl. value to be compared with t~,,~ will be selected <br />from a standard table of critical values for the Student's t- <br />distribution. The test will be one-tailed with cc = 0.1. Eowever, <br />because the denominator in equation 6 is not quite as efficient as <br />the denominator in equation 5, the degrees of freedom must be <br />calculated using eq•~ation 7. <br />(7) <br />- 2 2 2 <br />S~ + SZ <br />df- nl - 1 nz - 1 -2 <br />z z z z <br />~R sl 1) (n 1 1) + (n sz 1) (n ++ 1) <br />~ i z z <br />2.05-26 (Revised OS/12j87) • <br />(Revised 04/15j94) <br />