Jeff Sauro • December 3, 2007

Enter a z-critical value and get the area under the normal curve (a percentage). Selecting two-sided provides the area above Z and below -Z. Selecting one side provides the area only above or below the Z-value. See also the interactive Graph of the Standard Normal Curve. To convert a percentage into a Z-Score use the Percentile to Z-Score Calculator.Download this calculator in an excel file or take a Crash course in Z-scores

5 Visualization Techniques for Managing the Customer Experience

10 Things to Know about a Key Driver Analysis

How to Conduct a Usability test on a Mobile Device

Nine misconceptions about statistics and usability

A Brief History of the Magic Number 5 in Usability Testing

5 Examples of Quantifying Qualitative Data

How common are usability problems?

Should you use 5 or 7 point scales?

The Five Most Influential Papers in Usability

97 Things to Know about Usability

10 Things to Know about Usability Problems

What five users can tell you that 5000 cannot

Does better usability increase customer loyalty?

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

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

Quantifying the User Experience 2nd Ed.: 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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