Paired t-Test Calculator
Before values (space/comma)
After values
The paired t-test compares means of two related groups (e.g., before and after measurements on the same subjects). It tests whether the mean difference is significantly different from zero.
- 1Calculate differences d = before − after
- 2Mean difference d̄ and standard deviation s_d
- 3t = d̄ / (s_d/√n)
- 4Compare t to critical value for df = n−1
Before: [20,22,19], After: [18,20,18]=Mean diff = 1.67, t = 1.53, df = 2, not significant
| df | α=0.10 | α=0.05 | α=0.01 |
|---|---|---|---|
| 5 | 2.015 | 2.571 | 4.032 |
| 10 | 1.812 | 2.228 | 3.169 |
| 20 | 1.725 | 2.086 | 2.845 |
| 30 | 1.697 | 2.042 | 2.750 |
| ∞ | 1.645 | 1.960 | 2.576 |
References
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