Statistics for Engineers and Scientists - With Access
4th Edition
ISBN: 9781259275975
Author: Navidi
Publisher: MCG
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Textbook Question
Chapter 8, Problem 12SE
The article “Enthalpies and Entropies of Transfer of Electrolytes and Ions from Water to Mixed Aqueous Organic Solvents” (G. Hefter, Y. Marcus, and W. Waghorne, Chemical Reviews, 2002:2773–2836) presents measurements of entropy and enthalpy changes for many salts under a variety of conditions. The following table presents the results for entropies of transfer (in J/K · mol) from water to water + methanol of NaCl (table salt) over a
Concentration (%) | Entropy |
5 | 1 |
10 | –1 |
20 | –7 |
30 | –17 |
40 | –28 |
50 | –39 |
60 | –52 |
70 | –65 |
80 | –80 |
90 | –98 |
100 | –121 |
- a. Fit polynomial models of degrees 1. 2. and 3 to predict the entropy (y) from the concentration (x).
- b. Which degree polynomial is the most appropriate? Explain.
- c. Using the most appropriate model, find 99% confidence intervals for the coefficients.
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Chapter 8 Solutions
Statistics for Engineers and Scientists - With Access
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