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-r Nt i <br />Rev sior, No. l <br />Cate: 3/16/88 <br />F'age E. of <br />Accuracy Formulas and Protocol: <br />Accuracy, % f _X - T 1 (l0U) <br />K <br />K = k ncv:-, addition of the spi b. ed compoun <br />X = anal tical result from the spiked sample <br />T s analytical result from the unspiked aliquot <br />Accurecr = % Recovery <br />Standar: :-eviation - determines variation among several recovery <br />samples, used to establish upper and lower warning and control <br />limits. <br />S if x - x )z <br />n - 1 <br />where <br />S - stancard deviation of % recovery <br />X s observed value <br />X t mean or average of all observations <br />n =number of observations <br />UCL s X + 3 S <br />L C L . 'Tc' - 3 S <br />UWL 'R' + 2 S <br />LWL 2 S <br />The above procedures are used to establish initial date <br />validation procedures. All of the information gained by these <br />formulas is recorded so that the limits can be updated as <br />necessary, and is' used by the laboratory in evaluating sample <br />data. <br />