P-Value Calculator
P-values and critical values for z-tests, t-tests, and chi-square. Two-tailed t with df = 10 and α = 0.05 is 2.228.
P-Value0.0404
α = 0.05Significant
α = 0.01Not significant
p < 0.05 — Statistically significant at α = 0.05
Critical value at α = 0.05±1.960t critical (df = 10) ±2.228
A t critical value is the t statistic with upper-tail probability α (or α/2 when two-tailed). Choose T-test to use it as the main result. df = 10, two-tailed, α = 0.05 gives 2.228.