Analysing Test Results

After accumulating sufficient test results, you can use the following website to determine whether the test results obtained during usability testing are significant or not.

[VassarStats: Website for Statistical Computation]

One-Tailed Test - used when direction of the difference has been predicted.
Two-Tailed Test - used when difference has been predicted, but not the direction.
Standard Deviation - the variance of the data from the mean.
T-Test - statistical test that compares means.
Independent Samples - compares means of different groups of subjects.
Correlated Samples - compares two different measures using the same subjects.
Single Sample Test - test one group of subjects against one mean.