Quantifying the User Experience

by Sauro; Lewis

• ISBN13: 9780123849687
• ISBN10: 0123849683
• Format: Paperback
• Copyright: 2012-03-16
• Publisher: Elsevier Science

Summary

You're being asked to quantify your usability improvements with statistics. But even with a background in statistics, you are hesitant to statistically analyze their data, as they are often unsure which statistical tests to use and have trouble defending the use of small test sample sizes. The book is about providing a practical guide on how to solve common quantitative problems arising in usability testing with statistics. It addresses common questions you face every day such as: Is the current product more usable than our competition? Can we be sure at least 70% of users can complete the task on the 1st attempt? How long will it take users to purchase products on the website? This book shows you which test to use, and how provide a foundation for both the statistical theory and best practices in applying them. The authors draw on decades of statistical literature from Human Factors, Industrial Engineering and Psychology, as well as their own published research to provide the best solutions. They provide both concrete solutions (excel formula, links to their own web-calculators) along with an engaging discussion about the statistical reasons for why the tests work, and how to effectively communicate the results. *Provides practical guidance on solving usability testing problems with statistics for any project, including those using Six Sigma practices *Show practitioners which test to use, why they work, best practices in application, along with easy-to-use excel formulas and web-calculators for analyzing data *Recommends ways for practitioners to communicate results to stakeholders in plain English

Table of Contents

Dedication

Acknowledgements

About the Authors

Introduction and How to Use This Book

Quantifying User Research

How Precise Are Our Estimates? Confidence Intervals

Did We Meet or Exceed Our Goal?

Is There a Statistical Difference between Designs?

What Sample Sizes Do We Need?

Summative Studies

What Sample Sizes Do We Need?

Formative Studies

Standard Usability Questionnaires

Six Enduring Controversies in Measurement and Statistics

Wrapping Up

Appendix

Index

Table of Contents provided by Publisher. All Rights Reserved.