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Get Full Access to Statistics For Engineers And Scientists - 4 Edition - Chapter 7.4 - Problem 8e
Get Full Access to Statistics For Engineers And Scientists - 4 Edition - Chapter 7.4 - Problem 8e

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# The article “Oxidation State and Activities of Chromium,

ISBN: 9780073401331 38

## Solution for problem 8E Chapter 7.4

Statistics for Engineers and Scientists | 4th Edition

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Problem 8E

Problem 8E

The article “Oxidation State and Activities of Chromium, Oxides in CaO-SiO2-CrOx Slag System” (Y.7. The National Xiao, L. Holappa, and M. Reuter, Metallurgical and Materials Transactions B, 2002:595-603) presents the amount x (in mole percent) and activity coefficient y of CrO1.5 for several specimens. The data, extracted from a larger table, are presented in the following table.

 X Y X Y X Y 10.20 2.6 7.13 5.8 5.33 13.1 5.03 19.9 3.40 29.4 16.70 0.6 8.84 0.8 5.57 2.2 9.75 2.2 6.62 5.3 7.23 5.5 2.74 16.9 2.89 20.3 2.12 33.1 2.58 35.5 2.31 39.4 1.67 44.2 1.50 48.0

a. Compute the least-squares line for predicting y from x.

b. Plot the residuals versus the fitted values.

c. Compute the least-squares line for predicting y from 1/x.

d. Plot the residuals versus the fitted values.

e. Using the better fitting line, find a 95% confidence interval for the mean value of y when x = 5.0.

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