Page 21 - Statistics II for Dummies

Introduction 5

Part IV: Building Strong Connections

with Chi-Square Tests

This part deals with the Chi-square distribution and how you can use it to
model and test categorical (qualitative) data. You find out how to test for
independence of two categorical variables using a Chi-square test. (No more
making speculations just by looking at the data in a two-way table!) You also
see how to use a Chi-square to test how well a model for categorical data fits.

Part V: Nonparametric Statistics:
Rebels without a Distribution

This part helps you with techniques used in situations where you can’t (or
don’t want to) assume your data comes from a population with a certain dis-
tribution, such as when your population isn’t normal (the condition required
by most other methods in Stats II).

Part VI: The Part of Tens

Reading this part can give you an edge in a major area beyond the formulas
and techniques of Stats II: ending the problem right (knowing what kinds of
conclusions you can and can’t make). You also get to know Stats II in the real
world, namely how it can help you stand out in a crowd.

You also can find an appendix at the back of this book that contains all the
tables you need to understand and complete the calculations in this book.

Icons Used in This Book

I use icons in this book to draw your attention to certain text features that
occur on a regular basis. Think of the icons as road signs that you encounter
on a trip. Some signs tell you about shortcuts, and others offer more infor-
mation that you may need; some signs alert you to possible warnings, while
others leave you with something to remember.

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