The article Pulp Brightness Reversion: Influence of
Chapter 0, Problem 14.7(choose chapter or problem)
The article Pulp Brightness Reversion: Influence of Residual Lignin on the Brightness Reversion of Bleached Sulfite and Kraft Pulps (TAPPI [1964]: 653662) proposed a quadratic regression model to describe the relationship between x degree of delignification during the processing of wood pulp for paper and y total chlorine content. Suppose that the actual model is a. Graph the regression function 220 75x 4x2 over x values between 2 and 12. (Substitute x 2, 4, 6, 8, 10, and 12 to find points on the graph, and connect them with a smooth curve.) b. Would mean chlorine content be higher for a degree of delignification value of 8 or 10? c. What is the change in mean chlorine content when the degree of delignification increases from 8 to 9? From 9 to 10?
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