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Attachment 2 <br /> Application of the One-sided T-test to Dissolved Zinc Concentrations at A 72 <br /> For each flow class- <br /> Compile the dissolved Zn data for the two data sets, and calculate for the number of <br /> samples each set. <br /> (2) Let -, the significance level of the test, be 0.05 <br /> (3) Look up t, __ for df= nR+ nM - 2 in Table A -4 of NBS - 91, where <br /> df = degrees of freedom; <br /> nR = number of samples in the reference set; and <br /> nM = number of samples in the monitoring set. <br /> (4) Compute the mean (RR and Rm)and variance(s2R and s2,,,,) for the reference (R) and <br /> monitoring (M)sets. <br /> (5) Compute the pooled variance of the two data sets <br /> Sp = — (nR - 1 )S2R+(nM- I)S2M <br /> nR+ nM - 2 <br /> (6) Compute the test statistic, u <br /> u = tl-cc * sp * nR+ nM <br /> nR * nM <br /> (7) If(xM - RR)> u, decide that the average of the post-closure monitoring period exceeds <br /> that of the reference water quality set; otherwise, decide that there is no reason to believe <br /> that the average of the post-closure monitoring period exceeds the average of the <br /> reference water quality set. <br /> 113lI-7.L/Ji96 6. <br /> a <br />