## Calculating Sample Size for Task Times (Continuous Method)

###### By Jeff Sauro, PhD . September 17, 2004 . Tags: Task Times, Sample Size

We already saw how a manageable sample of users can provide meaningful data for discrete-binary data like task completion. With continuous data like task times, the sample size can be even smaller. The continuous calculation is a bit more complicated and involves somewhat of a Catch-22. Most want to determine the sample size ahead of time, then perform the testing based on the results of