Based on experience in teaching, some new topics have been added to the second edition. A notable omission in the second edition of the book was statistical analysis of data. This has been addressed by the addition of a new Chapter (Chapter 9) on Statistical Inference. This Chapter introduces basic statistical distributions, which are useful in the next Chapter on approxima- tions. In view of this addition, the initial part of Chapter 10 on approximation has also been edited and two new subsections on least squares fit when there are errors in both x and y, and on Maximum Likelihood methods have been added. In keeping with these additions some computer programs have also been added and a few have been modified.
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