In a Figure presents a control chart for individual measurements applied to viscosity measurements… 1 answer below »

In a Figure presents a control chart for individual measurements applied to viscosity measurements from a chemical process taken every hour. Note that many points are outside
the control limits on this chart. Because of the nature of the production process, and the visual appearance of the viscosity measurements in Fig., which appear to “drift” or “wander” slowly over time, we would probably suspect that viscosity is auto correlated. Set up a control chart on the residuals from on appropriate time series model for this process.

 

                

 

 

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