Is this a paired test?
No. The calculator runs Welch’s unpaired test. Pair your data manually if observations are matched.
Step-by-step walkthrough
T-test Calculator Guide
Use this companion guide beside the interactive calculator to make sure you understand the “why” behind every click. Each section includes the classroom explanation, student-friendly language, and quick practice prompts.
Before you start
Collect the data points listed below and double-check their units. Keeping an organized “givens” list is one of the fastest ways to reduce math errors and impress exam graders.
- t-test
- hypothesis test
- p-value
Detailed procedure
Step 1
Enter the two samples as comma-separated lists.
Step 2
Ensure each sample has at least two observations.
Step 3
Review the mean difference, t statistic, degrees of freedom, and p-value.
Teaching & troubleshooting tips
How accurate is the p-value?
P-values rely on the Student’s t CDF via the incomplete beta function, giving accurate probabilities for common degrees of freedom.