The previous installment (Part 38, American Laboratory, May 2010) outlined the regression diagnostic steps needed when replicates are not exact. This article will illustrate the protocol using the nitrite data that have been used throughout this series (please refer to Part 38 for details on each step). To avoid an “overload” of plots and numbers, only the results for the middle concentration (62.5 ppt) will be illustrated for Steps 1 and 3.

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