Question: 2. Redox potential or ORP (for oxidation-reduction potential) is a new method for assessing the efficacy of disinfectants used in water treatment plants. A case

2. Redox potential or ORP (for oxidation-reduction potential) is a new method for assessing the efficacy of disinfectants used in water treatment plants. A case study reports 31 daily measurements of chlorine and sulfur dioxide used at a municipal wastewater treatment plant in California.17 The chlorine measurement data are given in SqcRedoxPotent.txt. Use commands similar to those in the displays (13.5.3) and (13.5.9) to construct the CUSUM and EWMA charts for the chlorine data. Comment on what the charts suggest regarding the process mean.

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