Calculate the t-statistic for comparing the means of two independent samples.
How It Works
How T-Test Calculator Works
The difference between the two sample means is divided by an estimate of how much that difference could plausibly vary just from random sampling — a large t-statistic (far from zero) suggests the two groups' averages are genuinely different rather than differing by chance alone.
FAQ
Frequently Asked Questions
What do I do with the t-statistic once I have it?
Typically it's compared against a critical value from a t-distribution table (based on your degrees of freedom and chosen significance level) to decide whether the difference between groups is statistically significant.
Why "Welch approximation"?
This calculator doesn't assume the two groups have equal variance, using Welch's method for the standard error instead — a safer default than the classic pooled-variance t-test when group variability might differ.
