One Sample T
Enter your data below to perform the statistical test and view results.
One Sample T-Test
Compare sample mean to population mean (small sample, σ unknown)
Calculate: sum of all values / number of values
The value you are testing against (target/benchmark)
Standard deviation calculated FROM YOUR SAMPLE (not population)
Count of observations (degrees of freedom = n - 1)
Risk of false positive you accept (0.05 = 5%)
Choose based on your research question
Enter values and click Calculate to see results
All calculations follow standard hypothesis testing framework
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Quick Reference
α (Alpha): Significance level (typically 0.05)
p-value: Probability of results given H₀ is true
Reject H₀: When p-value < α
Two-tailed: H₁: μ ≠ μ₀
Left-tailed: H₁: μ < μ₀
Right-tailed: H₁: μ > μ₀