The article Oxidation State and Activities of Chromium Oxides in CaO-SiO 2 -CrO x Slag System (Y.

The article €œOxidation State and Activities of Chromium Oxides in CaO-SiO₂-CrO_xSlag System€ (Y. 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 CrO_1.5for several specimens. The data, extracted from a larger table, are presented in the following table.

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.

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