T Test Calculator
Calculate a one-sample t statistic, standard error, and degrees of freedom using sample mean, hypothesized mean, sample standard deviation, and sample size.
Formula:
t = (x̄ − μ₀) / (s / √n)
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Privacy: calculations run locally in your browser. No inputs are stored or transmitted.
How it works
This tool computes the one-sample t statistic, standard error, and degrees of freedom. It does not assume a known population standard deviation.
Examples
- x̄ = 72, μ₀ = 70, s = 8, n = 25
- Standard error = s / √n
- Degrees of freedom = n − 1
FAQ
- What kind of t test does this page calculate?
This page calculates a one-sample t statistic using sample mean, hypothesized mean, sample standard deviation, and sample size.
- What is the formula for the t statistic?
t = (sample mean − hypothesized mean) / (sample SD / √n).
- Why must sample size be at least 2?
A one-sample t test needs at least 2 observations so that degrees of freedom n − 1 is at least 1.
- Are calculations stored?
No. Everything runs locally in your browser.