The Quantification of User Experience: Practical Statistics for User Research, Second Edition, provides practitioners and researchers with the information they need to confidently quantify, qualify, and justify their data. The book presents a practical guide on how to use statistics to address common quantitative issues in user research. It tackles questions that users face daily, including: Is the current product more user-friendly than our competitor's? Can we be sure that at least 70% of users can complete the task on their first attempt? How long will it take for users to purchase products on the website? This book offers a foundation for statistical theories and best practices necessary for their application. The authors draw on decades of statistical literature from the fields of human factors, industrial engineering, and psychology, as well as their own published research, providing both concrete solutions.