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- S& ((O?Sllf?2 <br />Where: <br />SEsac = Satterthwaite-approxi mated Standard Error <br />sbr= bond release site (reclaimed site) sample standard deviation <br />sfef = reference area sample standard deviation <br />nbr= bond release site (reclaimed site) sample size <br />nref = reference area sample size <br />Next, the Satterthwaite degrees of freedom are calculated as <br />a <br />(SE a <br />-? ,ral - ll ( 4 <br />4) <br />..nf -1. <br />Where: <br />dfsa, = Satterthwaite-approxi mated degrees of freedom <br />Lastly, a one-sided reverse-null t-test with alpha = 0.20 is used as follows: <br />Revised April/09 TR58 2.05.4(2)(e) -19R <br />,oppmucd )34/ 200