Student T Test Calculator
Calculate the t-statistic and p-value for an independent two-sample t-test (equal variances assumed). Enter the sample statistics for two groups.
Published by:
isCalculator Editorial Team
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How to use this tool?
How to Use the Student's t-Test Calculator
This calculator performs an independent two-sample t-test assuming equal variances. Follow these steps:
- Enter Group 1 data: Provide the sample size (n₁, integer ≥2), mean (x̄₁), and standard deviation (s₁, ≥0).
- Enter Group 2 data: Provide the sample size (n₂, integer ≥2), mean (x̄₂), and standard deviation (s₂, ≥0).
- Click "Calculate": The tool will compute the t-statistic, degrees of freedom (df), and two-tailed p-value.
- Interpret results:
- A small p-value (typically <0.05) suggests a significant difference between group means.
- The formula used is displayed below the result for reference.
Note: All inputs are numeric. Standard deviations must be non-negative, and both cannot be zero simultaneously. Sample sizes must be whole numbers ≥2.
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Frequently Asked Questions
A Student's t-test is a statistical test used to compare the means of two groups to determine if there is a significant difference between them.
This calculator assumes that the two samples are independent, the data are approximately normally distributed, and the variances are equal (pooled variance).
The p-value is computed using the t-distribution with degrees of freedom equal to n1+n2-2. It is two-tailed, meaning it tests for difference in either direction.
