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Tag: Calculator
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Pages
The following pages have the tag Calculator associated with them. The number of users that have also tagged the page ' Calculator ' is in parenthesis.Calculating a Sigma Level from Task Success ( 207 )
Often the most reported measures of usability is task success. How does task success translate into a quality sigma value that can be compared to other reported sigma values?
Restoring Confidence in Usability Results ( 177 )
Adding confidence intervals to completion rates in usability tests will temper both excessive skepticism and overstated usability findings. Confidence intervals make testing more efficient by quickly revealing unusable tasks with very small samples.
Graph and Calculator for Confidence Intervals for Task Times ( 168 )
Visualizing your task time data is an essential step in understanding its distribution and computing accurate confidence intervals. This calculator creates a dot-plot of your task times, transforms the raw data to adjust for non-normality and computes the intervals.
Sample Size Calculator for Discovering Problems in a User Interface ( 157 )
Use this calculator to determine the number of users you'd need to test given the probability of detecting a problem. If the probability of detecting the problem is unknown, this calculator also allows you to estimate the problem occurrence (p) from sample data.
Z-Score to Percentile Calculator ( 149 )
Look up the area under the normal curve (1 or two-sided areas) from a standard score (Z-score).
Sample Size Calculator for a Completion Rate ( 148 )
Use this interactive calculator to understand how the sample size changes will affect the confidence interval around a completion rate.
Percentile to Z-Score Calculator ( 129 )
Enter the area under the normal curve (a proportion between 0 & 1) and get the Z-critical value.
Questions
No questions have the tag Calculator associated with them.