14.9 The article "Pulp Brightness Reversion: Influ-ence of Residual Lignin on the Brightness Reversionof Bleached Sulfite and Kraft Pulps" (TAPPI [1964]:653-662) proposed a quadratic regression model to de-scribe the relationship between x = degree of delignifica-tion during the processing of wood pulp for paper andy = total chlorine content. Suppose that the populationregression model isy =22075x-4x² + ea. Graph the regression function 220 +75x4x²over x values between 2 and 12. (Substitute x = 2,4, 6, 8, 10, and 12 to find points on the graph, andconnect them with a smooth curve.)b. Would mean chlorine content be higher for a degreeof delignification value of 8 or 10?c. What is the change in mean chlorine content whenthe degree of delignification increases from 8 to 9?From 9 to 10?

Part A: To graph the regression function 𝑦=220+75𝑥−4𝑥2+e for x values between 2 and 12, we can…

Answered: 14.9 The article "Pulp Brightness…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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An article in Wood Science and Technology, "Creep in Chipboard, Part 3: Initial Assessment of the lInfluence of Moisture Content and Level of Stressing on Rate of Creep and Time to Failure" (1981, Vol. 15. pp. 125-144) studied the deflection (mm) of particleboard from stress levels of relative humidity. Assume that the two variables are related according to the simple linear regression model. The data are shown below x = Stress level (%) 54 54 61 61 68 68 75 75 75 y = Deflection (mm) 16.473 18.693 14.305 15.121 13.505 11.64 11.168 12.534 11.224 a. Calculate the least square estimates of the intercept (a) and slope (b). What is the estimate of o (c)? b. Find the estimate of the mean deflection if the stress level can be limited to 69% (d). c. Estimate the change in the mean deflection associated with a 8% increment in stress level (e). (a) 1.118 (Round your answer to 2 decimal places.) (b) i 12.936 (Round your answer to 3 decimal places.) (c) -2.216 (Round your answer to 3 decimal…
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