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Quantifying the User Experience: Practical Statistics for User Research offers a practical guide for using statistics to solve quantitative problems in user research. Many designers and researchers view usability and design as qualitative activities, which do not require attention to formulas and numbers. However, usability practitioners and user researchers are increasingly expected to quantify the benefits of their efforts. The impact of good and bad designs can be quantified in terms of conversions, completion rates, completion times, perceived satisfaction, recommendations, and sales.

The book discusses ways to quantify user research; summarize data and compute margins of error; determine appropriate samples sizes; standardize usability questionnaires; and settle controversies in measurement and statistics. Each chapter concludes with a list of key points and references. Most chapters also include a set of problems and answers that enable readers to test their understanding of the material. This book is a valuable resource for those engaged in measuring the behavior and attitudes of people during their interaction with interfaces.

Quantifying the User Experience: Practical Statistics for User Research

Dedication
Acknowledgements
About the Authors
1. Introduction and How to Use This Book
2. Quantifying User Research
3. How Precise Are Our Estimates? Confidence Intervals
4. Did We Meet or Exceed Our Goal?
5. Is There a Statistical Difference between Designs?
6. What Sample Sizes Do We Need?

Part 1: Summative Studies
7. What Sample Sizes Do We Need?

Part 2: Formative Studies
8. Standard Usability Questionnaires
9. Six Enduring Controversies in Measurement and Statistics
10. Wrapping Up

Appendix
Index