What is the Unpaired (Independent) T-Test Calculator?

The Unpaired (Independent) T-Test Calculator is a statistical tool designed to help students, researchers, and analysts determine whether the means of two independent groups are significantly different from each other. By entering the sample means, standard deviations, and sample sizes of the two groups, the calculator computes the t-score. This allows users to evaluate hypotheses about group differences in experiments, surveys, or clinical studies quickly and accurately, without manual calculations.

How to Use:

1. Enter Sample Mean 1 (X̄₁): Input the average value from the first group.
2. Enter Std Dev 1 (s₁): Input the standard deviation of the first group. Must be ≥ 0.
3. Enter Sample Size 1 (n₁): Input the number of observations in the first group. Must be ≥ 1.
4. Enter Sample Mean 2 (X̄₂): Input the average value from the second group.
5. Enter Std Dev 2 (s₂): Input the standard deviation of the second group. Must be ≥ 0.
6. Enter Sample Size 2 (n₂): Input the number of observations in the second group. Must be ≥ 1.
7. Click “Calculate”: The tool computes the unpaired t-score using the formula t=Xˉ1−Xˉ2(s12/n1)+(s22/n2)t = \frac{X̄₁ – X̄₂}{\sqrt{(s₁^2/n₁) + (s₂^2/n₂)}}t=(s12​/n1​)+(s22​/n2​)​Xˉ1​−Xˉ2​​.
8. Review Result: The output displays both sample means, standard deviations, sample sizes, and the calculated t-score, with clear formatting for easy interpretation.