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• In model A of the difference of the means test, t calt is <br />determined using equation 5. <br />(5) <br />where: <br />t _ X I X 2 <br />colt - <br />n + n n7+n <br />n + n - 2 <br />X, = release area mean crop production, <br />X = reference area mean crop production, <br />s, = release area sample variance, <br />S = reference area sample variance, <br />n, = release area sample size, and <br />n = reference area sample size. <br />• The t,� 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 a = 0.1 and degrees <br />of freedom = n, +n -2. <br />In model B of the difference of the means test, t ca1C is <br />determined using equation 6. <br />(6) <br />t - s - s <br />2 2 <br />S, s <br />n -1 n -1 <br />2.05 -51(c) (Revised 04/15/94) <br />• <br />