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<br />• where: a is the difference between means, <br />~ n is the number of observations in each sample, and <br />Sx2 is the pooled sum of squares. <br />If the txo samples are of unequal size, xe calculate t by the equations <br />t - d nln2(ni + n2 - 2) / (nl + nz) Sx <br />Calculated t le then compared to tabular tat 2(n-1) degrees of freedom and <br />the desired level of probability. Because the regulations provide no <br />criterion regarding comparability, xe propose the T teat at tha 9996 level <br />of probability.. Comparability of reference areas, for each attribute <br />measured, x111 be established when calculated t is less than tabular t. <br /> <br />• <br />t <br />to <br /> <br />