Statistical Methods for Psychology (Seventh Edition) by David C. Howell (University of Vermont) PDF

By David C. Howell (University of Vermont)

ISBN-10: 0495597848

ISBN-13: 9780495597841

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Additional info for Statistical Methods for Psychology (Seventh Edition)

Example text

On a screen in front of the subject, he briefly presented a comparison set of one, three, or five digits. Shortly after each presentation he flashed a single test digit on the screen and required the subject to push one button (the positive button) if the test digit had been included in the comparison set or another button (the negative button) if the test digit had not been part of the comparison set. ) The numeral “5” was not part of the comparison set, and the subject should have responded by pressing the negative button.

The most important large statistical packages, which will carry out nearly every analysis that you will need in conjunction with this book, are Minitab®, SAS®, and SPSS™, and S-Plus. These are highly reliable and relatively easyto-use packages, and one or more of them is generally available in any college or university computer center. Many examples of their use are scattered throughout this book. Each has its own set of supporters (my preference may become obvious as we go along), but they are all excellent.

E. If random assignment is not possible in this study, does that have negative implications for the validity of the study? f. What are some of the variables that might influence the outcome of this study separate from any true population differences between boys’ and girls’ incomes? g. Distinguish clearly between the descriptive and inferential statistical features of this example. 21 The Journal of Public Health published data on the relationship between smoking and health (see Landwehr & Watkins [1987]).

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Statistical Methods for Psychology (Seventh Edition) by David C. Howell (University of Vermont)

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