Jeff Sauro • February 6, 2006

This calculator takes raw task times, transforms them using the Natural Logarithm and computes a confidence interval. The values are displayed in the dot-plots graph below. You can also download an excel version of this calculator.3 Days of Hands-On Training on UX Methods, Metrics and Analysis

Denver: Aug. 17-19 2016

Controlling for Brand Attitudes in UX Studies

15 Mobile UX Facts and Insights for 2016

5 Examples of Quantifying Qualitative Data

8 Ways to Show Design Changes Improved the User Experience

Nine misconceptions about statistics and usability

The Five Most Influential Papers in Usability

Does better usability increase customer loyalty?

How to Conduct a Usability test on a Mobile Device

Confidence Interval Calculator for a Completion Rate

Why you only need to test with five users (explained)

97 Things to Know about Usability

A Brief History of the Magic Number 5 in Usability Testing

Should you use 5 or 7 point scales?

10 Things to Know about Usability Problems

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Customer Analytics for DummiesA guidebook for measuring the customer experience Buy on Amazon | |

Quantifying the User Experience: Practical Statistics for User ResearchThe most comprehensive statistical resource for UX Professionals Buy on Amazon | |

Excel & R Companion to Quantifying the User ExperienceDetailed Steps to Solve over 100 Examples and Exercises in the Excel Calculator and R Buy on Amazon | Download | |

A Practical Guide to the System Usability ScaleBackground, Benchmarks & Best Practices for the most popular usability questionnaire Buy on Amazon | Download | |

A Practical Guide to Measuring Usability72 Answers to the Most Common Questions about Quantifying the Usability of Websites and Software Buy on Amazon | Download |

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