Teste t — 2 Amostras Independentes
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
Welch
About this calculator
The t-test 2 Independent Samples calculator is a useful tool for researchers and statisticians who need to compare the means of two independent populations.
This calculator uses Welch's formula, a modified version of the traditional t-test formula, when the variances of the two populations are not equal.
The t-test is a fundamental tool in statistics to compare the means of two groups and determine if the observed differences are statistically significant.
Here you can calculate the t-test value, understand if the difference between the means is statistically significant and know the probability of observing that difference if the means were equal.
Frequently asked questions
What is the t-test?
The t-test is a statistical tool used to compare the means of two groups and determine if the observed differences are statistically significant.
When to use this calculator?
This calculator is useful when you need to compare the means of two independent populations and are unsure if the variances are equal or not.
What is Welch's formula?
Welch's formula is a modified version of the traditional t-test formula, used when the variances of the two populations are not equal.
How to interpret the results?
The results show the t-test value, the probability of observing the difference if the means were equal, and if the difference is statistically significant.