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Where: <br />SEsat = Satterthwaite- approximated Standard Error <br />s = bond release site (reclaimed site) sample standard deviation <br />sref = reference area sample standard deviation <br />nbr = bond release site (reclaimed site) sample size <br />n ref = reference area sample size <br />Next, the Satterthwaite degrees of freedom are calculated as <br />4 <br />E s al <br />sat — 4 <br />4 <br />�7E \ � t �,7E f � <br />( n b , —1 + n 1 <br />f <br />Where: <br />dfsat = Satterthwaite-approxi mated degrees of freedom <br />(Revised: PR -06) 2.05.4(2)(e) - 64 <br />