The two-sample t-test is a useful means of comparing samples from two different data sets. However, it isn’t the sole tool for use when looking for variance. You’ll want to consider other ...

This web calculator conducts a pooled-variance t-test for a difference between two populations' means when standard deviations are unknown and equal. The calculator includes a video definition, an ...

The core use of this statistic is for direct comparison between two samples to check their differences. The t-statistic is a ...