One-Sample t-TestStatLens

Choose a dataset:

Paste data (one column with header, or CSV):

Open a CSV, TSV, or JSON file:

Sample mean (x): Sample SD (s): Sample size (n):

Results update as you type — no need to press anything.

Variable:

Parameters

H₀: μ =

H_a: μ 0

Confidence level

Select a dataset or enter summary statistics — results appear automatically.

Test whether a population mean μ differs from a hypothesized value, using a t-statistic and the t-distribution.

Load data from the Datasets, Edit Data (paste), or Open File/URL tab, or use Enter Summary to type the sample mean, SD, and n directly.
Null value: type the hypothesized mean μ₀ in the H₀ row (defaults to 0).
Alternative (H_a): click the toggle to cycle ≠, <, > for a two-sided or one-sided test.
Conditions checkpoint reminds you to check the sample size and shape before trusting the result.
Confidence level sets the matching interval (default 0.95).
Results — t, df, p-value, the confidence interval, and the plot — appear automatically as you change inputs. There is no Compute button.

New to this tool? Walk through it step by step.