December 2010
Intermediate to advanced
1276 pages
41h 42m
English
book
Advanced Engineering Mathematics, 10th Edition
by Erwin Kreyszig, Herbert Kreyszig, Edward J. Norminton
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CHAPTER 25
Mathematical Statistics
In probability theory we set up mathematical models of processes that are affected by “chance.” In mathematical statistics or, briefly, statistics, we check these models against the observable reality. This is called statistical inference. It is done by sampling, that is, by drawing random samples, briefly called samples. These are sets of values from a much larger set of values that could be studied, called the population. An example is 10 diameters of screws drawn from a large lot of screws. Sampling is done in order to see whether a model of the population is accurate enough for practical purposes. If this is the case, the model can be used for predictions, decisions, and actions, for instance, in planning productions, buying equipment, investing in business projects, and so on.
Most important methods of statistical inference are estimation of parameters (Secs. 25.2), determination of confidence intervals (Sec. 25.3), and hypothesis testing (Sec. 25.4, 25.7, 25.8), with application to quality control (Sec. 25.5) and acceptance sampling (Sec. 25.6).
In the last section (25.9) we give an introduction to regression and correlation analysis, which concern experiments involving two variables.
Prerequisite: Chap. 24.
Sections that may be omitted in a shorter course: 25.5, 25.6, 25.8.
References, Answers to Problems, and Statistical Tables: App. 1 ...
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