Paired T-Test Calculator
Raw Paired Data (5 pairs)
Enter matched before/after values
From Summary Statistics
Formula
t = mean_d / (sd_d / sqrt(n)), df = n - 1
Frequently Asked Questions
What is a paired t-test?
A paired t-test compares two related measurements, such as before-and-after observations on the same subjects. It tests whether the mean difference between paired observations is significantly different from zero.
When should I use a paired t-test vs an independent t-test?
Use a paired t-test when observations are naturally paired (e.g., same person measured twice). Use an independent t-test when comparing two separate, unrelated groups.
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