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Statistics, 8th Edition
Robert S. Witte,
San Jose State Univ.
John S. Witte,
University of California, San Francisco
ISBN: 978-0-471-72229-8
©2007
560 pages
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New to This Edition
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Reduced to 21 chapters.
Chapters 2, 5, and 8 expanded.
- A new emphasis on expressions involving sums of squares and degrees of freedom, beginning with variance and standard deviation in Chapter 4; continuing through correlation and regression in Chapters 6 and 7; and including analysis of variance in Chapters 16, 17, and 18.
- The importance of variability is stressed and includes new Figures 4.2, 14.1, 15.1, and 16.3, as well as data graphs with error bars in new Fig. 14.4.
- An expanded treatment of estimates of effect size, beginning with Cohen’s standardized estimate, d, in Chapters 14 and 15; continuing with the squared curvilinear correlation coefficient in Chapter 16; its partial counterpart in Chapters 17 and 18; and concluding with Cramer’s squared phi coefficient in Chapter 19.
- Chapter 1 has been expanded by including more material on inferential statistics and also coordinates various types of data with levels of measurement, a topic formerly relegated to an appendix. New mate-rial on experiments and observational studies has been added and includes a discussion of confounding variables.
- Chapter 4 focuses exclusively on the unbiased estimate of the sample variance with degrees of freedom in its denominator, as well as the corresponding version of the sample standard deviation. Moved forward to Chapter 4, the treatment of degrees of freedom, including the reason for n-1 in the denominator of the sample standard deviation, has been revised extensively with the aid of new Table 4.5.
- Chapter 6 includes new material (Table 6.3) illustrating positive, negative, and zero relationships with the z-score formula for r , and also a new section about the effect of range restrictions on the correlation coefficient.
- Chapter 18 expands the interpretation of significant interactions with F tests, as well as multiple comparison tests, for simple effects.
As usual, questions, examples, and computer outputs have been updated.
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